Most of the houses I work on here in Southern California have few if any accessible design features. For a homeowner who uses a wheelchair, even a single step at the entry is a serious impediment. Over the last several years, I’ve put my welding skills to good use building access ramps out of readily available steel parts.
It may surprise you to find out that you're not in business to exercise your skill as a craftsman, to get a sense of pride from a job well-done, or to enjoy a sense of freedom by being your own boss. As good as those benefits are, they're by-products, not the purpose itself.