I was about 5 years behind you on a Commodore 64. Same problem no way to save. Copied and reworked several programs, but I had an added frustration. Our whole area would lose power about 5-10 times per week. No warning. No pattern. So I started over a lot.
Each time I started over, I got faster, and tried new things that I would not have tried if that section was already “done”.
These days I have to accidentally delete files to get that level of creativity.