Do you know all those "failed" side projects you've worked on? All those story ideas, half-baked artwork, and those tutorials you only partially finished?
Those are NOT FAILURES. They are like little nuggets of learning that you have been investing in. Like collecting sea glass on an infinite beach of possibilities.
Do not consider that wasted time. You explored an idea, or some creative thought. Now take that learning and carry it forward to the new thing.