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That's a good start, I sent you a message with a board on here that's for advertising art. I think that might work better.
As for your other social media, all the advice I can give you is to keep posting your work and do your best to spread it. It takes a while to grow a platform on social media, but it does help once you have a following. If you're offering work for free, you'll grow that much faster!
In the meantime, you can just make websites that show off your talent. If it's what you like to do then just do it a lot. You'll get better, and you'll have a portfolio to show off to people that might interest them in your service.