I don't know you so that makes it a bit more difficult...
Take a look at Dan Miller's book(s) 48 Days to the Work you Love, No More Mondays. I've read the former, have the latter, it's in my reading stack.
If I can summarize it boils down to doing and inventory of what you can do (skills, training, etc) and what you love to do... the age old question if money weren't an issue what type of work would you do (and then figure out how to get paid for it). I've had some say well I enjoy doing a little of everything, then I would try this question. What makes you feel most alive? Or, another way of looking at it, what gives you the greatest feeling of accomplishment? For example, for some people, it may be one on one coaching, for others it may be public speaking, maybe for you building custom hand crafted wooden furniture. I don't know, something to think about. If what you love to do is different from what you're doing now then you may need to use the skills you have to earn a living while you put together a plan and then work the plan to fully support yourself. I believe God has wired everyone with a passion or love for some type of work. I think that the expression of that is up to us. Work is good, God created work. Probably so we wouldn't get bored (I don't think I have a Scripture reference for that) .
So, all of that said, you mentioned you have experience doing carpentry. Are you passionate about carpentry? If so, is it specifically around word working or more generally around the creation and building process. ie, more about seeing a finished structure or object come into being from raw materials.
You also mentioned that back injuries mean you are unable to do it for very long. What about teaching an hour or two long course? Maybe a basic home carpentry skills or handyman skills (like how to swing a hammer, put a nail in, etc)? Determine what a reasonable fee would be... Maybe 10-20 bucks a person. Keep the group reasonably small so that you can interact with everyone... maybe 10-15 people. Work through a couple of basic tasks and offer a door prize of a free session to your advanced class which would layer on the next level of skills.
This particular idea may need tailoring for your area if most people know how to do this. I live in a large metro and I know there are people who struggle with basic home maintenance skills but if you live in a more rural area this may not be the case. Hopefully this helps in some way, if nothing else perhaps helps kickstart the creative process. I don't get here often but I'm sure the group is happy to be a sounding board.
Blessings,
Chris