I think that a great way to advertise on social media without spending money is to give away free stuff.
People love free stuff. You do. And so you do your customers. So give them free stuff. Lots of it.
Give away ebooks, videos, blog posts, consultations, or whatever else you can think of.
Quality free products or services that actually prove your worth are a million times more valuable than any paid ad. And posts for free stuff get shared – a lot! That will get you exposure and reach that you can’t get on your own.