Still holding out hope that Hawley's Doom movie got re-purposed into a Disney+ series and that's one of the mystery Phase 6 projects.
Have Doom make appearances in films and shows throughout phases 4-6 (anywhere from cameos to minor roles) building him up as the behind-the-scenes mastermind pulling the strings. Give him a focused limited series to flesh him out.
It's gonna end up resembling how they handled Thanos from 2012 through 2018 which worked out really well.
Thanos:
2012 - First Appearance/Cameo in
The Avengers
2014 - Second Appearance/Supporting Role as secondary Villain in
Guardians of The Galaxy
2015 - Third Appearance/Cameo in
Avengers: Age of Ultron
2018 - Fourth Appearance/Lead Role as Main Villain in
Avengers: Infinity War
2019 - Fifth Appearance/Lead Role as Main Villain in
Avengers: Endgame
Doom:
2022 - First Appearance/Cameo in
Black Panther: Wakanda Forever
2023 - Second Appearance/Cameo in ???
2024 - Third Appearance/Supporting Role in
Fantastic Four
2025 - Fourth Appearance/Supporting Role as secondary Villain in
Avengers: The Kang Dynasty
2025 - Fifth Appearance/Lead Role as Main Villain God Emperor Doom in
Avengers: Secret Wars
I would prefer for Secret Wars to get pushed to May 2026. More time to build up hype and anticipation after Doom kills Kang at the end of Kang Dynasty and we end on another Infinity War note of the heroes losing and feeling hopeless as the credits roll.
Imagine that final frame inside a giant IMAX screen:
God Emperor Doom will return.