You shouldn't delete your game as it will delete all your boosters.🫣 Regarding the season pass, it requires levels to keep progressing. I think maybe it's no more level to complete, so it disappears from your game.
I'm not sure if it's a good news or not since I'm not at the end of the map yet. Some players lost their game's events and features after updated their game. I hope this won't be happen on my game.