The biggest myth we are fed as artists is that we need to sustain ourselves solely on our art. This is ridiculous. Every artist has at some point in time had some other job. Some of them kept these jobs their entire lives. In the latter category: William Carlos Williams was a doctor in New Jersey; Henry Darger was a custodian in Chicago; Harvey Pekar was a VA Hospital clerk in Cleveland.
So quit your day job…or don’t—you’re a real artist either way.