Get a team! Seriously, it sounds you're basically working alone most of the time. This doesn't work for most people (including me) - find a small, "doable" project, doesn't have to be world changing, that you and some other people can complete (complete = getting to measurable result) in a month or two. Even if it fails, you're still in a mentally & emotionally better situation than before. Don't put too much pressure on yourself, you've got time for those world-changing projects later on.