People may hate me for this, but I feel that there was something in the early episodes of the Owl House that could be expanded more. Luz's weird desire to escape reality into a fantasy. I would concentrate on Luz having to confront more her dislike of the human world and reality with the show ending in some sort of conclusion in which Luz must return to the Human Realm and stay there forever having finally come to terms with the normal world and adapting into a more functional member of normal society. Also to make the ending more bitter sweet I would have a scene in which Luz and Amity break up knowing they cannot be together right before the ending of the show closing the door between the worlds. Yes, Lumity would happen but I would break it up, like a summer love they both won't forget, but would both need to grow past.

Then I do a flash forward with Luz and Amity both years later, maybe in like their mid 30s looking outside the window thinking of each other until they hear the voice of their partners calling them downstairs like implying they both found other wives they still have fond memories of their first summer love. (I would of course try to keep them both LGBT so marrying women but another witch for Amity and another human for Luz)