One option is a minimum of happiness - brightly lit office, decent food, music.
The other option is a minimum of productivity. I like to wash dishes after a bad day lol. Work from office. Use AI to handle the blank page problem (you can reject everything it says afterwards).
The trick with side projects is to complete and ship them. The first side project should be limited to 10 hours max. Sometimes shipping is the hard part. Once you can do this, add more time. Do 20 hours, 40 hours, 100 hours, and so on. But progressively. If you start by making the world's greatest something, it will drain all your motivation and energy, especially once the bloat kicks in.