I haven't, but four different members of my RV club have, their solutions varied.
One bought a Damon Challenger that was too big for what he wanted to do, but kept learned to live with it, kept it until he died.
One bought a Damon Daybreak, it was also too big for just the two of them, and their kids didn't like using something that big. They liked my C so they traded the Daybreak on a Sunseeker with similar floorplan. That turned out to be not as comfortable or usable, so the traded the Sunseeker on a Winnebago 29B Outlook that was essentially the same model as my 29B Spirit. They used that for the next five years until one of them died.
A bus driver in our group bought a 38 foot Beaver, used it for a couple of years until they figured out they didn't really like RVing. They sold the motorcoach and used the proceeds to go one cruises, something that turned out to be what they really liked to do with their vacation time.
A widow in our group bought a Dynamax Isata because she thought it would be easier to drive now that she was alone, but found the floor plan unlivable after a year of trying. She traded it on a BT Cruiser that was arranged in such a way that she could strip out the furniture she wouldn't use (foldout bed) and replaced it with a recliner she would sleep in. She used that BT Cruiser regularly until she died, about eight years.
Count me as number five. My Spirit 29B was ideal for the way my wife and I were using it, it is way too big for the way I want to use it, but it is usable and paid for. I'm just not using it much because RVing without my wife hasn't been comfortable, let alone fun. Same options: keep it and use it; trade it for (or sell it and buy) something more suitable if I can figure out what that is; quite RVing and do something else with my time (been doing that anyway, three cruises and three escorted tours since my wife died).
What is common to all these cases is that all of us (4/5 retired and on fixed income) got into RVing without overextending financially. This keeps options open, something we tend to do when old, because we know that illness can change everything in an instant.
So the answers are: keep it and learn to live with it; sell it and get something more suitable, if you can figure out what that is; or sell to give up on RVing.
If your question is really about how to get out of a financial situation, been there too. When overextended on debt, I've drastically cut back my lifestyle for several years to pay down the debt, so that the bulk of my income would no longer be going to pay interest on all the stuff we bought that we didn't need and didn't use.