Things I can think of ( but haven't done)
Any skills/ experience of job you can do purely online.
Campsite worker, possible in UK and Europe. Quite physical ( hence why I couldn't do it!) but if you're good with people and can cut grass, clean toilet blocks and some maintenance and admin work....
In Europe it's quite common for singles or couples to stay at a property and do odd jobs in exchange for board and room. I had a couple of different people stay in France and work 3-4 hours a day, gardening, decorating and the like.
Teaching ? As in TESOL.
You don't need any of that you can just turn up on a piece of waste land in Spain along with a couple of hundred others with no facilities and call it living the dream. If you tried it in this Country you would be called objectionable names and ordered to leave by a Court usually within a couple of days.
As for jobs to do. Some have written books about their travels. You could of course do what others have done and work for 50 years get a pension and then enjoy life in the slow lane. Certainly beats working.
Translation if you have a language(s). A friend of mine gets text sent to him, he translates it at the taverna in Greece and sends the translation back. He has some face-to-face meetings with his clients in Winter, but the rest of the time they are unaware of where he is.