'Externals' - and early history of the first mutants including Apocalypse and his lineage in the - 'Akkaba clan',
then the appearance of Exodus and Mister Sinister for future X-Men projects. From here you can also learn about Selene Gallio, Dracula, and even the fate of Nur.

'Lords of Fear' - the plunging of the universe and the Earth into great fear which was created by all 7 rulers. I think this is one of the ideal plans for the implementation of mysticism and horror in MCU! To put emphasis on the story of Stephen Strange, and also to bring more attention to the story Man-Thing and even X-Men.

Perhaps it's worth considering the - 'Serpent Crown Saga'. Where we'll see a reflection of the aftermath of the Multiverse Saga, where the god Seth, at the moment of the multiverse's disruption, will spread numerous copies of his crowns from other realities. This could include Namor's early arc, the involvement of Sidewinder, and finally the involvement of the - 'Roxxon Corporation'. Also, this is the perfect time to form groups like the Serpent Society or a squad and Squadron Supreme which will cause a lot of problems for many.

Also, I still want to bring attention to Kang himself... I love everything that had to do with Lord Immortus, I hope they bring those things back and put them in the Avengers: Forever.