That specific fight I posted never actually happened in the comics, and I could survive the X-men staying with Fox, tbh. Fox does create well-made movies, I'm just tired of all the movies being hyperfocused around Logan/Charles/Magneto/Mystique. I want to see everybody getting shine. Death in comics is played out IMO. You already know it's never going to stick and that they'll just come right back when the next writer shows up.
For Fantastic Four, make their first movie a 60s period piece where they fight Doom. In the end, the team traps themselves in the Negative Zone with Doom to save the world.
In the Negative Zone, none of them age, allowing the characters to appear in the modern Era where they'll cameo in other characters' movies. Then build up the next phase of films leading to a confrontation: all of Earth's heroes versus Galactus.
For X-men, I would make it a Netflix/Cable TV series. They could explain that Professor X has been using his psychic abilities to hide the world's knowledge of mutants until Anti-mutant organizations find ways to work around his powers, exposing mutants world-wide.
Season 1: The OG X-men as teenagers. Storm, Wolverine, Colossus and Nightcrawler join in the season finale.
Season 2: The Claremont/Byrne era, the Phoenix/Dark Phoenix sagas and Days of Future Past. (Jean doesn't die, and Kitty Pryde travels back for DoFP.)
Season 3: God Loves Man Kills, the New Mutants, The Brood Saga, Wolverine in Japan, Storm losing her powers, and the Trial of Magneto
Season 4: Cyclops vs Storm, Mutant Massacre, the Austrailan Outback, X-Factor vs Apocalypse, and everyone vs. Sinister at the end. (I would leave Madelyne Pryor out of this continuity entirely, and have Cyclops duel Storm out of his distrust of Magneto instead.)
Season 5: Jubilee and Gambit are introduced. X-tinction Agenda happens, and they fight Magneto one last time (X-men #1-3)
If the show gets popular enough, make a season 6 that is all about Age of Apocalypse.