Fire Joe (or demote him, whatever works) - hire a new head coach with a real staff and experienced assistants.
Let go of the all-3s all the time approach of the offense. If that means a complete overhall of the offense, lets do it.
We are so far away from a sustainable, flexible offensive approach that I think they just need to start over.
Run actual plays! Plays require setting good screens, off ball movement, getting the defense to move. We are pretty crappy at most of that. We are terrible screeners, we don't move ANYONE away from the ball, and we let every def we play off the hook because 3-4 of them can just stand there the whole shot clock. Since we are crappy at a lot of that stuff, we need to learn it, and practice it and become experts at it.