I’ve met folks in unusual industries that need ongoing tech work/knowledge but have no desire to have this knowledge and effort in house. Medical device manufacturing was one such field. (work was government compliance, and server patching/network maintenance)
The way to find these is to really just look for a job which emphasizes enterprise, a tech you know, and the main focus being upgrade from version X to version Y. Bonus points if this is in a large firm with minimal competition in its sector.
These companies largely need someone to be there in case they might need some job done, but generally they need people to pretend to be busy. With remote work, they probably don’t need you to try particularly hard at that.
This. I had two tries at starting up last decade, failed. Good for me, I had some back up plans. Beyond all, I realised, a regular salaried job is a privilege. There is nothing wrong in taking up a full time 9-5 job. In my case I had a full time job, before, and just continued it after my venture went under water. For some reason such a job which is something most people aspire for, is considered some sort of a failure in entrepreneur community. You get a salary every month, with annual bonus, and health care plus vacation covered. How is this failure? If anything this is the best thing that can happen to many people on this planet.
I'd advice the OP to consider taking up a full time job. If you have started up and seen any amount of success at all, chances are you will do good at interviews and eventually at your job. Do this for a few years until, fix your health and finances- and then work from there.