Magneto

1): Wolverine (A origin story of Wolverine, and have Sabertooth be the villain, and treat this project like Iron Man 1, and not treated like X-Men Origins: Wolverine)

2): Professor X and Magneto (A origin story of Charles Xavier and Magneto and how they met, and then have Magneto become a villain)

3): Cyclops (A origin story of Cyclops)

4): Jean Gray (A origin story of Jean Gray)

5): Storm (A origin story of Storm)

6): Beast (A origin story of Beast)

7): Quicksilver (A origin story of Quicksilver)

8): X-Men (Have it be like Avengers 1, Magneto be the villain, have Professor X be the Nick Fury of the X-Men, Have Cyclops be the leader of the X-Men, and have Wolverine, Beast, Jean Gray, Storm, and Quicksilver be the other members of the X-Men)

- And then have more X-Men films to add more members to the X-Men

I think the big bad villain of the MCU Mutant Saga should be Magneto.

And I think Magneto's goal should eliminate all of the humans and leave only the mutants on Earth to make the future of humanity. Because he thinks that eliminating all the humans would help protect the mutants, because he wants to protect the mutants.

So basically like Thanos trying to eliminate half of the population of every planet in the universe to save them from over population.

And maybe even like Doctor Doom trying to make BattleWorld so that way no incursions will happen in other people's universes.

How does that sound 😃?

From 2015 we have already Quicksilver (X-Men member) and Scarlet Witch, both of them are children of Magneto from X-Men saga. But there is somebody who was, in my opinion, the most important character for the MCU's X-Men, Baron Strucker, who he gave the powers to Pietro and Wanda. So if in MCU, Baron Strucker has already made more mutants before Wanda and Pietro?

Then in She-Hulk: Attorney at Law, when She Hulk searches for new jobs on a blog site, there is an article about a man with metal claws who appear in a bar. And also later we saw a cameo of the classic Wolverine suit. In the last episode, She Hulk ask when the X-Men will appear, something which means that she knowns that X-Men are exist. All this references of X-Men are due to the fact that Wolverine was the Hulk's nemesis in the comics as seen in Deadpool & Wolverine.

We also see Professor-X from an other universe in Doctor Strange in the Multiverse of Madness and a lot of X-Men characters in Deadpool & Wolverine from other universes.

But, in The Marvels, we saw Beast who was in X-Mansion with Professor-X. This was an other appearance of a X-Men character in an other universe, no in MCU, like in Deadpool & Wolverine. But Beast appearance was different. This sence was in a post-credit sense, which mean that like the all other post credit-sense, we will see the continuity in the future.

Adamantium, Wolverine's claw's material, is appeared in Eternals and in Captain America: Brave New World as the material which is made of a Celestial, an article in the same episode of She-Hulk: Attorney at Law which Wolverine appear, mentioned the dead Celestial.