There was a thread created a while ago called "mission of the month". The idea was you would state your goals for that month and then report back on your progress. It sort of didn't go anywhere, but you could either revive that thread or create a similar one.
I you have the capability, making recordings and posting them can really give yourself a sense of accountability. If you don't have the capability to record, you should add that to your list of goals because listening to recordings of yourself playing is a very useful tool in improving your playing. When you are frustrated, you may very well discover that you sound better than you think!