Great list! I have another to consider that I personally have 35+ years experience providing. Clean up litter outside commercial properties on foot using inexpensive hand tools. It’s almost as easy to do as going for a walk! I started doing this as a side gig in 1981 and soon grew it into a profitable full-time business. I share my experience in my book, Cleanlots.
eBay: eBay is one of the most popular websites in the world, period. That means it’s a great way to attract lots of eyeballs to your unwanted items, fast. Initially designed as an auction site for DIY sellers, it’s now primarily a venue for fixed-price (though often heavily discounted) sales by professional merchants. Still, as long as you include high-quality photographs and thorough descriptions in your product listings, you can likely break through the noise. eBay’s fee schedule is complex, but as a general rule, expect to lose 10% of your final selling price to the site’s commission.