
There is a theory/spoiler on twitter I found about 138.
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Eren had already knew about Zeke's death and planed for it, so he uses the war hammer titans power to hide his true body somewhere. He escapes and goes to historia and her child. Historia's baby has just inherited the beast titan because of zeke's death and is the most recently borned child. Eren then touches the child and re starts the rumbling causing many of the alliances deaths. Falco, gabi and armin escape and 138 end there.
I predict that eren will fulfill his plan and probably will end the world and hatred creating peace for pardis.
But this is all just what I found and based of the Akatsuki no Requiem theory which is basically the idea based of a music video of aot s3 endings. This is all better explain here in this subreddit
https://www.reddit.com/r/titanfolk/comments/i9kljg/full_breakdown_of_akatsuki_no_requiem_and_kimi_ga/
UNCENSORED YURI SMUT!!! I need to take a few laps after that