I work every other month in the O&G industry, which affords me every other month completely off. Since its hard to do a standard side hustle that would allow me to work every other month I had to be inventive. I have always liked going to yard sales and flea markets and purchasing little things for myself, so I decided to rent a booth at a local antique mall and resell items I purchase at yard sales and flea markets. I am able to turn a hobby into $400-600/mo profit. Ive been doing this for 8 months and im now looking to get a 2nd booth at a different antique mall.
One piece of advice I would give is to figure out what available hours you have in a day/week/month to devote to a side hustle without taking away from your relax time. Then look for inventive ways to best work within those hours.
My wife and I also use Rover.com and watch peoples dogs. We set our cost at $25/day and we are already at home watching our own dog, why not watch another one, get paid, and entertain my dog. It also fully pays for dog food, cat food, heartworm pills and vet visits.