I know I've been saying it the longest, but for the MCU X-men they need to take it back to '75 with Giant-Sized X-men #1 as their starting point. The Jim Shooter years were the GOAT era for Marvel comics hands-down, IMO.
Cats want to stan the 90s era because we were kids back then and the cartoon was hot, but in terms of impact, legacy, and overall storytelling, 80s Claremont >>>>>>>>>>> the 90s if we really want to keep it a stack.
Use the Sentinels as the main villains instead of Krakoa (since Magneto needs a break).
I would also either drop Sunfire, Thunderbird, and Banshee, or swap them out for more popular characters (like Rogue, Psylocke, and/or Gambit).