To answer your question, exits.com is a great resource for people seeking smaller acquisitions.
If I may insert a personal opinion, I feel like for single person businesses, the potential upside is so great for you that it's going to be hard to find a buyer willing to make you an offer you can't refuse. I'd advise you ride this one out into the sunset. It's a subscription business, you could definitely squeeze at least 5 peak years out of it before it starts to fizzle out. Maybe you could move somewhere cheap and maximize the profits
I've seen this first hand. I worked at a product studio that had a few businesses which were costing nothing but generating >$20kUSD per month. I'd set up the business to be as no-ops as possible, so it can basically run itself, reap the profits. Next, take all this other advice and sell, sell, sell yourself to MS/GOOG/AWS.
If I may insert a personal opinion, I feel like for single person businesses, the potential upside is so great for you that it's going to be hard to find a buyer willing to make you an offer you can't refuse. I'd advise you ride this one out into the sunset. It's a subscription business, you could definitely squeeze at least 5 peak years out of it before it starts to fizzle out. Maybe you could move somewhere cheap and maximize the profits