The hardest thing I’ve ever had to learn (and still struggle with) is that no writing, drawing, sculpting, painting, sewing, baking; no making or act of creation of any kind is a waste of time, just because you may have nothing to show for it at the end.
Your failures are as important as your successes. Your practice sessions are what makes your masterpieces possible. You don’t need to show something tangible to prove the time spent was worth it. the Time spent was worth it.
You need not produce a thing, to have accomplished a thing.