But anyway, you can prune interior branches and leaves that aren't getting sun. That should have (and maybe has been) done a while ago. And at this point, any that are being shaded most of the time, that won't grow anything can still be removed. Though, I leave a lot of those alone until the plant has drawn out the nutrients it has stored in them. After it's used them up, they have to go. Fungal infections love starting on dying branches. Good luck friend!