Ok so like I know I've said alot of times that if feel like DP should've been more arc focused and I stand by that so here's how I would personally do it without changing much about the original show. Just tweaking and reshuffling some episodes here and there.
So in my head it would be smaller story arcs that seed into major ones.
So the first arc would essentially just be season one of the original show but with more focus on Dannys powers him getting used to them, his supporting cast and his rouges.
With a bigger focus on the overarching narrative and character driven moments.
Would lay the seeds for his and Valeries rivalry turned relationship.
Sewing the seeds for Danny's rivalry with Vlad.
The Halloween episode would also be very important too.
Fanning the flames would most likely be the same just with the added bonus of having prior build up so that Ember herself doesn't just come out of nowhere so over the course of the season you have little references to her maybe you hear her song in the background or you see a poster of her just fun little blink and you miss it Easter eggs that set her up as part of the world.
Another big change I'd make this season is Skulkers motivations. So instead of him simply hunting Danny for sport now you have the added angle of him hunting Danny at Vlad's request. So Vlad hears about this ghost hunter who's been heroing around amity it piques his interest(he thinks it might be Jack)be so he sends Skulker after him Skulker gets beaten by Danny and Vlad decides to hold the reunion at his castle as a way to lure Jack in and thats how we get bitter reunions as the mid season finale.
Apart from these changes the season would remain largely the same as the show with the last major change being Rein Storm becoming the season finale replacing control freaks.
The reason for that being that Rein storm is the first episode where Danny is acknowledged as a hero and I feel like the whole "It's not invisobil its Danny Phantom" line would work super well as an origin arc closer.
Also we're cutting out my brothers keeper at least for now.
Then onto season 2(Arc 2)
First change is that we're cutting out memory blank or rather I should say we're taking certain concepts from it and kinda just spreading it across multiple episodes.
I like memory blank its a well written episode but considering it mainly exists just to retcon in Danny's logo I'd rather just nix it entirely. Danny can just get his logo in the season one finale. Instead.
So a main theme with the first half of the season is that Danny's overconfidence and negligence of his friends is very much out in the open. He's not a straight up asshole or anything like that but stuff like him bailing on Sams movie marathon to go to Paulinas party or him using his powers to get back at bullies etc basically a bunch of stuff that shows that the power is going to his head.
So that brings me to the first episode of the season control freaks it plays out like the show with the added change that Danny is left very scared afterwards being used as a pawn and doing evil shit messes him up a bit but he doesn't wanna deal with that so he hides it and thats where the overconfidence and shit comes into play..but well he's not dealing with his emotions right and as a result he lashes out alot.
Which would lead into my brothers keeper only this time there isn't a happy ending he's still taking things really hard and spectra manipulating him makes it even worse.
Then Double Cross my heart and flirting with disaster happen and Danny is sort of at his emotional breaking point in terms of everything. Prisoners of love would also set up the GIW for later on in the season and we would see the guys in white appear a few more times just as minor antagonists or fodder for danny to beat in a few episodes.
And thats when we have the ultimate enemy as the mid season finale.
Where Danny is closer to becoming Dark Danny than he ever was before. The Big changes to this starts when Danny intentionally steals the test answers from Lancer becauss with everything going on the past few episodes Danny is too stressed to think of studying the exploding sauce packets thing is nixed and replaced with the ecto filtrator needing to be replaced. This episode would be all about what happens when you shirk your responsibility. Danny has been using his powers irresponsibly, ignoring his responsibilities at school in favor of taking the easy way out and also ignoring his responsibilities at home. So the episode plays out kind similarly Danny is stresses about the CATs and when he's on his breaking point, box lunch shows up and the 2 fight until the end up in Lancers office where Danny sees the answers and decides to go for it. The rest of the episodes play out the same except for the Lancer thinks danny stole the answers subplot cuz it doesn't make much sense instead Jazz goes to Danny's room looking for him and she finds the answers and tells Lancer that Danny has it Lancer tells her that danny has up until the test to return it yada yada. Then the episode plays out the same as it did again up until after Dark Danny does the CATS in Danny's place. Instead of asking them to meet at the Nasty Burger instead Lancer goes to fenton works Where Dark Danny has made sure that the ecto filtrator is about to blow he traps them Danny shows up and it plays out the same as the show once again with the main difference being that now Danny is alot more conscious of the types of choices he makes.
The rest of the season is pretty chill and really plays out exactly the same with the only extra thing is the GIW monitering Danny's movement and after Kindred Spirits Danielle's movements. They're looking for ghost artifacts that can take him down and thats when they find the reality gauntlet.
Which brings us to the season finale Reality trip. 2 major changes here the first being that it would be a 3 part finale instead of a 2 part one and the 2nd being that Danielle is gonna be involved.
So how it goes is that after numerous failed attempts to fight and capture Danny the GIW decided to switch gears. They found the reality gauntlet and went to the only person who knows how it works freakshow. From there the story plays out the same Dannys identity gets revealed and freakshow kidnaps their families and the GIW are after them. Another change is that while they are evading the GIW they hear one of them mention "Phantoms ghost sidekick" Danny immediately puts together that they're talking about Danielle so they go after her first and she's with them for the rest of the episode. The rest of the episode plays out the same just with Danielle more involved in the combat and stuff but she's still unstable and barely holding her own. They get the gems freakshow double crosses them and now it's danielle and danny vs freakshow and an army of zombie clowns. In the end Danny tricks freakshow just like the show he frees his family and they have the heart to heart he introduces a almost fully destabilized Danielle to them and they love her. Danny realizes how much harder all of this would be if he had to go it alone and he empathizes with how alone Danielle must feel so using the reality gauntlet and the power of retcon. He makes the entire world forget about his identity BUT he also makes it so that Danielle is not only stable but now a fully official member of the Fenton family becoming Danny and Jazz's little sister. He also uses it to scrub out all in the information that the GIW had on Danny, Danielle the fentons and the reality gauntlet.
And thats the end of the 2nd arc.
This was hella long ik and very messy but this is more or less how I'd kinda make the show more arc focused and actually have lasting consequences. Nothing for season 3 since I think that season would probably need to have much heavier rewrites but I'll probably figure something out. Lmk what you think!.