I rarely go back to rework old songs. I have done that a few times and I'd rather move on and write new stuff.

If you're stuck at a place.... you need to figure out what you need to do to push past that point and get unstuck. So if you have a bunch of tunes in the "sketch stage" you need to work on taking them to rough finished.

Better to have 1 rough finished than 12 sketches.... in my opinion.

Once you have finished, well constructed tunes, then you can work on the mixing and polishing stages. No need to polish a sketch because it isn't ready for prime time. You could do it for practice but it's lots of time spent on something thats not finished.... finish a few.

Regarding going back to old tunes. Unless I do a rewrite of some sort, the song rarely gets reworked. I move on and keep writing.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.