Advice for advancing photography

Hi everyone. I wanted to get some advice from the community here on advancing what I'm doing with my photography. Please let me know if this is too commercial - not trying to self-promote, just would like some ideas.

Photography has always been a fun hobby for me, and I'm not looking to make it a fulltime job. I mainly shoot outdoor adventures/experiences and some travels. 

This past year or so, I started selling some prints just to people I know who saw my photos on Facebook, Instagram, etc.. I had some encouragement to try to promote my work outside of these circles, so I started a Facebook page just for my photography itself as well as a print service page in addition to my portfolio. I've just posted a few photos so far to experiment but haven't promoted the page among my friends or anywhere else. Honestly I have a bit of aversion to self-promotion so this step is the hardest for me. 

https://www.facebook.com/sljphotos

What experience do people have with Facebook-based methods to promote a followership? I'd like to get some people outside of just my friend circles to tune in -- for example I live in Colorado, and it'd be great to have some people in my community following my work to order prints, etc.. 

I'm considering some of the Facebook ad programs, but I don't know how high yield they would be, and I'm working with a modest budget since this is just a side gig for me. If anyone has experience with promoting their photography Facebook page just through the ad service, I'd be really interested to hear about your experience.

I'd love to hear any experiences, ideas, thoughts... and of course I'd be flattered if you check out any of my work :). Thank you! Seems like a lot of smart and creative people frequent this site... would love your thoughts.