Thank you for your sobering replies! I knew things were bad, but did not realize how bad.
Here are the goals that I really want to accomplish, and was wondering if you could help me identify any other helpful venues or activities. Stock was only the first idea that popped into my head.
(1) Grow as a photographer by taking on specific projects with specific requirements. [stock was supposed to be one such project].
(2) Make use of existing photo portfolio and photo skills by helping worthy causes, with or without profit.
(3) Become an NPS member.
(4) Supplement my income.
To date, my main use of photography professionally has been to support another artist (by cataloguing and documenting their work for historic and promotional purposes).