Growth means your standards move before your results do.

At some point you can see what good looks like and cannot produce it yet. That gap is uncomfortable and it is also the reason you will improve, since taste pulls ability along behind it. People who quit here usually mistake the discomfort for lack of talent. Being dissatisfied with work that used to satisfy you is a measurement, not a warning.

When your own work disappoints you, write down specifically what is missing. Fix that one element in the next attempt rather than starting over. Keep the old version so you can see the distance later.