dA is constantly changing, it never stays the same and always caters to whatever's popular, which is usually fanart. I'm not really sure about the people following you, but you're pretty spot on if you believe that some people have stopped watching you because you haven't done as much fan based work as opposed to your own, as those kinds of pictures tend to draw in bigger crowds. At the end of the day though, it's a good way to weed out the casual fans and have a more grounded, loyal fanbase that's there for your art and your talent, as opposed to specific content you produce.
I mean, don't get me wrong, people are free to enjoy whatever art they're here for, but I personally prefer following artists who produce more original works than fanart.
I follow artists on Facebook, and watch artists on Deviant Art. Both are daily most of the time. Change is inevitable. I like that you can see different times in an artist's career by looking at their body of work in the feed here moreso than on Facebook. I will occasionally look at Tumblr or Reddit to follow certain artists or "franchises". Art is such a subjective thing, I don't know many people that follow comics, video games, card games and artists that work in these genres the way that I do. I think using more sites the better just to get your work out there.
Please keep posting here.