What sort of wording do you use in your Facebook posts? If you use words like ‘buy’, ‘sell’ ‘sale’, ‘sold’, ‘shop’ etc etc & generally links to your Folksy shop or whatever & Facebook will limit who can see them because they want you to buy their promotion packages.
It also depends on how many organic followers you have. If you’ve done the ‘like for like’ thing then the reason no one is liking or commenting is probably because they don’t care. If they’re organic follows who you’ve picked up who genuinely like you work then I’d consider what you post.
Photos are generally seen further afield. And you say you post every day- what sort of things do you post? If you post things out of general interest, progress of work etc then you’ll likely get more interest. If you just constantly try and sell, you won’t.
I use Facebook, Instagram, Pinterest & Twitter. I have personally made sales through all of those- in fact I’ve made more sales through Facebook but I prefer Instagram. I just find it much more interactive. It’s cleaner, much more pleasant to use & I find the community on there really supportive & friendly.
I don’t use them all as a tool just for selling my artwork though. I post things that I’ve been up to/places I’ve been that have nothing to do with my artwork.
I’d say pick up only organic followers. The like-for-like thing is pointless. It may look like you have a lot of followers that way but they’re generally not interested in what you post & wont engage & especially won’t buy. I tend to just ignore anyone who suggests that. I’ll only follow people if I like what they do/what they post. I don’t have that many followers on Facebook (not too many over 200 I don’t think) and I don’t post very often. Weekly if not less. But I get a decent reach, engagement & have sold something to about 20% of my followers.
Not sure if that’s going to be of any help to you. It’s just what I’ve discovered over the years.