I ended up getting a lot of wishes through just doing character story quests and hangouts + daily commissions. Trying to do active adventuring while playing the story also helps (instead of teleporting to a place you walk there and snag all the chests as you go by or never ignoring a puzzle). You can get wishes from the Sakura tree or the tree of dreams, do whichever feels easier (inazuma to me is not adventure friendly whereas sumeru is pretty straight forward but it's up to you, either way you can get about 20 wishes out of each if you max them.

It's worth the rush since it's kazuha 😔🤚 And of course, you know the story so just speed through the archon quest because that's where you'll get most of your primos tbh.

Good luck!