Ask HN: Where do you find single day software gigs?

I'm a retired software engineer who's been doing this since the days of MS-DOS 6. I've since transitioned to being a best selling author, but I still have a love for writing software. And being an author means I'm on a fixed royalty income, so short software gigs are my only way of getting a little extra cash. But none of my former clients ever need small jobs done, and literally nobody with single-day gigs on upwork ever gets back to me. Is there a website where someone like me can find 1-10 hour gigs, such as fiverr used to be?