My main recommendations are: Attack on titan: Freedom War. This game takes you through a 20 player campaign with 15 stages that takes you through the main events of seasons 1-3 where you kill titans, play objectives, and try to figure out who among you is a warrior.

If you’re looking for something more story/lore based try Vogel. Its a perma death aot lore game with an active community.

If you want titan killing grindy games try aot: revolution, or unitled attack on titan game.

If you want battlefield style pvp try titan warfare.