I also like this theory for the end game
So this is the content of the video;
Eren is not trying to bring about a rumbling and he's either planning to change Ymir and Zeke to change the past. Everything we have seen up until now has been part of Eren endgame. Because chapter 137 Eren, we know who can see into the future is kind of stupid for to get defeated with all of his powers.
He could have easily won on several occasions but didn't. Why?
Maybe because rumbling was always Ymir's desire, not his. Eren was just trying to get Ymir out of the paths and to do this he had to give her freedom. Eren orchestrated because he knew the only way to kill the titan parasite was to get the titan shifters from outside of the walls and counts to unite. This was the only way to free humanity from the power of titans by allowing to play out Armin and Zeke could get all the previous titan shifters to work together.
In chapter 137 Levi killed Zeke which means his power will be transported into the most recently born Eldian child I.e. Historia child. After rumbling stops he may head to find Historia child and use that child power to enter in path, but with no Ymir, Zeke or titan parasite to stop him. Then Eren would use time-travel to achieve his end game of creating a world without titans, a world where his friends get to live long and happy lives. So when Mikasa, Armin and rest realize that Eren sacrificing himself so they can all be free Mikasa delivers the final line "See you late, Eren" from chapter one.
Eren visit Grisha and Grisha hold Eren grandchild(Isayama realized the final panel of the story) this what eventually leads Grisha to give Eren founding and attack Titan to Eren. Also, we've been not seeing Eren point of view it can't happen unless there is something reason behind it.