I'll likely do a stream soon to showcase all the endings! But the hint I have is that the tortoise in the sky might have a hint if you help him out first.
It's been a long time since this comment, but we (finally) made a full tutorial on everything in the game, including steps on how to get the best ending. You can read it here: https://3hg.itch.io/animal-crackers/devlog/644552/a-complete-guide-to-animal-cra...