I have similar problems with developing pieces. I have tons of ideas but I often mentally block myself from putting them into a cohesive frame for whatever reason. What I do to break out of this is just force myself to finish a piece in a fixed time period (like a weekend). These weekend pieces end up generally being shorter and simpler than what I really want to be doing, but they do a lot to restore my confidence in my ability to actually finish something. Plus, once you have a completed piece, you may really like parts of it and start tweaking the parts that you may have rushed through. Your "weekend piece" might develop into something you really enjoy and want to share with others. If not, you at least have gone through the process one more time and will hopefully have more confidence and inspiration to move forward with some of your other works.
