When you get involved deeply in this Hobby, (Sport), and start helping others seriously the thought of a single project is a pipe dream.
Repairs and building programs with and for others quickly soak up all available time.
As for myself I have a number of groupings which I work through. Those in work, Those waiting for work to start, The wish list, and My personal squadron members that require maintenance.
Being over-committed can be a little depressing and slow your ability to explore newer models and designs.
As a recent example I started building my Tubby Cubby when the plans were first released and managed to finish it only a couple of weeks ago. In the time between starting and finishing the cub. I designed, built, undertook a full evaluation and development program and gave away about 3 of my own design, undertook repairs of 3 other badly destroyed retail foamies which were destined for the trash, Continued my prototype building program of my latest design, Started the renewal of my son's squadron of models, and continued to push ahead with my building of my retail offerings for the local retail outlet.
I sometimes long for the early days where I had only a couple of planes and every flight was an adventure. Now I do more maiden flights each week that I did total flights in my early times.
Avoid burnout and try to keep the hobby real and exciting. Do not think that I have lost the excitement of the hobby because I have not but the excitement is now different from the simple ability to keep the plane in the air and to land without damage!
Keep it real, keep it fun!
Have fun!