Personally as a music producer, I get you. When I'm looking back to my old projects I know I could have done better on some track samples or drums or melodies. Not exactly the same but I kinda know how that feels. But sometimes moving on to more complex qnd better projects means abandoning the old ones because the stucture and the over all image is not as good as your new ones. And also sence you are doing it out of intrest (just like me) Don't let others tell you how to make your own stuff because at the end of the day it ruins the fun you want to have. Everything I told you is from the heart so at the end do what you really what to do
Btw that hit me because I started music production for the same reason: to explore the art in my own way with the drive being pure intrest on the art
I also used one of HTA's background music for melody in one of my early tracks and funny thing is one of my most popular tracks that I made