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Seems the #1 option these days is Uber. Or Lyft. Just riding sharing apps. So you can play taxi for people and make some decent side money. Though not without its headaches, seems a ton of people go this route and continue to do so. As long as you have an acceptable vehicle, think it can't be older than a certain year, and have a good sense of direction (or good GPS), good manners and good hygiene, you could enjoy it. Many fully supplement their income this way.
You can also deliver food/packages, through a number of different courier apps. Uber has Uber Eats, then there's also Postmates, DoorDash, and many others.
You can rent out a spare bedroom, or even a house or cabin through apps like Airbnb.
You can also use apps that match freelance workers with people looking for odd end jobs/chores, kinda like you suggested, with 'gigs'. Apps like TaskRabbit or Handy, and many others, offer more manual labor type jobs, where the website gets a cut on both ends, for carrying out the transaction between you and the person with the task. But then there's also sites like Upwork and Fiverr, where you can sign up for more computer based tasks, like admin work or video/website/photoshop type projects. If you are skilled in a certain computer program, then its especially a good place to look.