Work on it in the two hours you have before work, every workday. My latest project is effectively impossible to complete (SaaS, evolving customer needs, etc),

Work on it in the two hours you have before work, every workday. My latest project is effectively impossible to complete (SaaS, evolving customer needs, etc), but I've been able to work on it consistently for the last 18 months AND get paid for it. Before that, I wrote books/articles about React, and before that I learned a lot by building products no one wanted. In short, consistent effort over a long time helps you accomplish things you think are impossible.