So now for the second part of me trying to put the events of Vector's and Fallen's in chronigical order. Through the second movie & other related media, we can infer that he later escaped it which might have to do with his essence escaping his prison in the dreamwave universe, going from sunstorm to jetfire, and probably forming a true body for himself.
Again the Fallen from the Dreamwave comics and the movies are the same Fallen, just at different points at time though there are cases where a multiversal being can be at multiple places at the same time since time flows different for them. That and the Fallen from the Uniend cluster i.e. the Aligned continuity, is not the same Fallen we see in the main multiverse universes. It seems he would also pop up in the Gargent cluster, gobot universes, where he's known as the "Evil One".
The rest of the Fallen's history is pretty much being in Tyran universes where alternate versions of the movies happen & smaller media. Though eventually he'd stop being a multiversal singular being when Nexus prime used the powers of the Star Saber and Terminus Blade in concert to solidify the walls between realities, limiting dimensional travel, and splintering all known singularities into infinite alternate variations of themselves, nullifying the concept. As you guess, the same happens to Vector so lets back to him.
Now with Vector finally having his memories restored & fixing the damages that unicron causes, and during the unicron singularity, he was called back to cybertron to help assist the Autobots in locating artifacts which would destroy the black hole. Now with Vector finally having his memories restored & fixing the damages that unicron causes, and during the unicron singularity, he was called back to cybertron to help assist the Autobots in locating artifacts which would destroy the black hole. During Balancing Act/Revelations, Vector & his allies would have to deal with some of unicron's minions like Ramjet & nemesis prime.
Vector was able to defeat Ramjet but the act weakened him considerably, so he went back to the Autobots on Earth and left Cybertron in the care of Over-Run & some other bots, thus the events of the Cybertron cartoon finally happening
After the events of Cybertron & other related media like Galaxy Force, he'd show up during Beast Wars Reborn and eventually end up on Axiom Nexus where he answered a bunch of our lore questions, with some studd happening during that as well. And as you can guess, he stopped being a multiversal being like his siblings, primus, and unicron. Basically what i was trying to get at was that Vector & The Fallen had to grow through their specific events god knows how many times.
Like sure they experience differently from us but it must get boring as hell. Though he misses Lori, Bud, and Coby. Also everyone he ever cares about will grow old and die in what, to him, is just the pulse of a spark. Sometimes, he feels alone even when he's in a crowd. Welp if you read me trying to put the life events of Vector and his brother in some sort of order, takes for listening, that's all. Ironically it seems that Vector & Fallen never crossed paths during all of this. Kinda sad really
Anyway thanks for listening if you were