Do you know there are companies and people out there that make some pretty good money offering their cleaning services to households and companies? They’ll come in and charge you either a set fee per room or an hourly fee to clean up. They can come weekly, monthly, or whenever you think you need some extra scrubbing. What’s the point? Why not have the person they hire be you?
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, a website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs.
Great list. I have another to add that’s almost as easy to do as going for a walk! Provide a litter cleanup service outside commercial properties for property management companies. The work is done on foot using simple hand tools. I started this service in 1981 as a side hustle and quickly grew it into a lucrative full-time business that I still operate. I share my experience with others in my book, Cleanlots, as well as offer free support.