I would sell it. What you have is a job but there are other people without jobs and a few thousand dollars who are willing to buy themselves job. Your business is probably worth more than you think as an operating business even if it’s not worth a fortune.
If this business nets you six figures, someone will probably pay close to six figures for it. If it nets you $50,000, I suspect someone might pay you $10,000 for it. You offer your equipment, inventory, contact list, customer lists, and training. You can structure the sale as something like $X up front, full time on-the-job training for 1-2 months included, plus the buyer’s option for a specific amount of continuing hourly training/consulting at your preferred rate for another 4-6 months. You teach them to do what you do, introduce them to your vendors and your customers as your new Vice President, and then later, he or she informs them that s/he has taken over the business. You leave with a little cash and they have a chance reinvigorating the company while keeping your old customers happy. If they fail, that’s on them.
To gauge how much it might be worth, and how to find a buyer, you can research similar opportunities on Loopnet.com, www.bizbuysell.com, and talk with a few business brokers or M&A brokers. Good luck.