Those are interesting ideas, some I’ve already tried, others I’ll give a chance.
Uber/Lyft takes a 25% commission and they treat us very badly. They treat us like company drivers while in reality we’re using our own cars, paying for our own gas, and being forced to pick up passengers bleeding, passengers that smell real bad, etc. I hope someday Uber/Lyft are sued.
Craigslist? I don’t trust it, too many spammers. Have you found work through that site?
Pet sitting: My apartment doesn’t allow animals and I can’t imagine a stranger asking me to stay at their home.
Writing ebooks: Been there, done that, doesn’t make enough money. Every ebook can take a long time to write, even if you hire someone to write it for you, and many fail to sell.
Selling plasma: I always wanted to do that. I’ll give that a try.