Can you please describe how cohost works? I remember having to pay for it, but idk if that's still the case, and is similar to Tumblr so that it'll be fairly easy to navigate?
You don't have to pay. When I signed up there was a waiting period between registration and being able to post. I have no idea if this is still a thing, but when I did it, it was about a day. (There's a Cohost Plus thing you can pay for but it's not mandatory and is presently only really for increasing your max upload size.)
It works a lot like Tumblr. If you're used to using this place, dollars to donuts you'll be able to use Cohost without any issue.
There is presently no algorithm, so no real built-in discovery. If you want to find stuff, search the tags and you'll probably find whatever you like.
You can hide 18+ content if you don't want to see it. This is, of course, dependent on people actually flagging their stuff as 18+, but as far as I've seen everyone's been really good about that.
The toggle is right inside the post box. Dead simple.
If you hate the color scheme but you use the Stylus extension, install this theme (https://userstyles.world/style/7690/cohost-theme-customizer) and you can make it any color you want.
There are no metrics. No way to see how many people have liked or reblogged your stuff, and no way to see how many followers you have. Some people hate this. I like it because it shaves some of the stress off.
You can toggle a bunch of things on other people's blogs depending on what you want to see.
There are no themes, but you can put images and junk into your sidebar, so you can still fancy up a bit.
As I mentioned in a prior post, you can make side-blogs, and those side-blogs all have their own feeds. So if you don't want your peas touching your potatoes, you don't have to let them touch.
There's probably more but that's about all I can think of right now. No, it's probably not a perfect solution for everyone and hopefully I'm not billing it as that. But it's great for people who love dicking around with HTML and CSS and just generally not being bothered by the kinds of crap we've gotten used to here and in other places so maybe some folks'll like it there.