I just came here to say that you just described Dr. Doom with this sentence and he's what the MCU should be focusing on next.
And Doom built a time machine just for the fukk of it with nobody's help.
Sorry, carry on. I'm just a big Doom fan...
They don't know bout Doom, breh.
Homie built a cult around himself just so he could more efficiently destroy alternate universes and stave off the end of existence.
Became a god, and creator of a new existence because he knew he was the only one that could do it.
Snatched Reed's wife and kids, made his oldest friend literal wall, and made his brother in law the sun.
And that's all one storyline.
As much as Iove the X-Men, the priority on Feige's table really needs to be finally getting Doom right.
Breh can be the protagonist, villain, and primary character for a future phase all in one.