It depends on how good you are, how dedicated you are willing to be, and how much you understand about publicity. If you were willing to put in a lot of effort and you are good enough, you could probably make yourself famous on YouTube without a very big budget. You just have to do it right. For example, don’t just post randomly; that won’t get you anywhere. Instead, post video responses to other videos which have just begun to go viral, and your videos should be covers of the songs you’re responding to, with your own original feel. Getting your videos to go viral is a science; you just have to study YouTube well enough. With enough publicity you would develop a large fan base and you could go anywhere from there.
At the same time, the Jewish market is definitely much easier to break into. Though I’m speaking as a guy (I sing as well); we generally gain publicity and break into the market through wedding gigs and stuff like that. I don’t know what it’s like for a woman.