This is what's worked for me.
I quit teaching after 18 years, and for 17 years I've been substitute teaching. Hubby was already retired and this gave us the freedom to travel for a month at a time, for example.
It also allowed me to mostly not work while my late daughter was ill.
Now, as I'm getting older, I can give myself a break as needed, but I can also have money coming in as needed. As I go various places, I can see if a mystery shop is on my way.
So, my suggestion is; see if your actual job can become a type of side gig. It might pay better than other side gigs.
When a flower doesn’t bloom, you fix the environment in which it grows, not the flower.
Alexander Den Heijer