Sorry to say but I dont see much demand for it. People typically do not want to pay for an appraisal unless they plan on doing something or need to do something with their home ( sell ir , or split it ina divorce, etc) . One of the problems residential appraisers face now is internet competition. Even if it is less "accurate" than an appraisal, if a person just wants to know what their home is worth, they can do an instant, online, and for free on Zillow , or any of the similar websites. With so much data online on these sites they can look up recent sales themselves and that's good enough for people who are just curious.
IMO it is hard to find ways to find other business with the residential license , /Idk how old you are but you seem to be on the younger side and ambitious, which is a good thing. Instead of trying to squeeze more water from a dry rock, perhaps think about getting a related license, such as RE agent or home inspector or property management. The side work beside some income,, will probably generate better appraisal leads than the ideas you are floating. The other option is to put in the effort to upgrade to commercial license, where the options are better for obtaining additional appraisal work