Skill needs depth, and depth needs repetition in one place. Ten shallow efforts feel productive because there is always something to do, but each one stays at the beginner stage where the work is hardest and the returns are smallest. Getting past that stage is where everything interesting happens, and you only get there by staying put long enough.

Choose one thing for the next three months and let the others sit. Not forever, just long enough to get past the awkward early part. Write the other ideas down somewhere so they stop nagging you, then give the chosen one the hours the rest were eating.