Starting shows excitement. Finishing shows character. Everyone has the first one.

Beginnings are easy because they are made of imagination, and imagination is free. The middle is where a thing stops being fun and becomes a list of unglamorous problems, and that is where nearly everyone leaves. Anybody can be enthusiastic on day one. What separates people is whether they are still there on day forty, when it has turned into plain work.

Go back to something you abandoned and give it two hours, not to enjoy it but to move it. Pick a version you can actually complete, then complete it, even smaller than you hoped.