Definitely should pick up a part-time job or something a little more stable and sustainable. I had a chat with a professional mangaka before and he said that same thing. Many artists have a job or two aside from their artwork, because, well it's the reality of what needs to be done in order to sustain the lifestyle they want. Sure it's not glamorous, but it beats starving and killing yourself and then coming to hate your work if it's not providing you money for all your basic needs. So as the mangaka told me, it's okay and it's normal to have a job or two even if their part-time while you work on your art too. It'll be tough because hey we're only human and everyone does get tired and all too. But if your work gets to the point you can live off it, that'll be awesome too. Just for now, think logically about what has to be done in order to provide for yourself and possibly your family if you have one. Best of luck.
