What do you do when we lose all interest in, say, creating music?
https://johnpweiss.com/blog/199949/the-day-the-muse-died
"Someday, the muse may die in you.
The thing you always loved suddenly doesn’t do it for you. If that happens, don’t panic. It might come back. But whether it does or not, try new things. Ask yourself what, of late, really excites you. Once identified, try it out."