I don’t have an answer to your question, but I think it is a question that many here have had to face. If you are restoring old bikes to make money, you may want to consider a new hobby. Even if you just build bikes for the love of it, eventually you will have to sell some. You’ve apparently gotten enjoyment out of both restoring the bike, then the riding of the bike built of your labor. If you don’t need to sell the bike right away, I’d put it up for sale the money you have in it, give it a couple of weeks, then reduce the price and repeat. It will be Spring soon.