I'm frustrated that I haven't really found my "artistic style". My drive and motivation for drawing is withering.
What are some ways I can try to boost this again? It's like some sort of creative depression, it sucks.
Maybe you should try freearting!
I did that once with paint. I hate wasting precious canvases but I was so depressed I grabbed one and just put lines on it and coloured bits in and painted shapes and a few words, as the whim took me. It didn't cure my depression but it was very therapeutic. :p alternatively you could just use some paper.
but yeah, freewriting helps loosen up a writer, and I think there's definitely such a thing as artist's block.
If you like drawing, you could randomly pick out a few photos, maybe from deviantart (are you aware of the Stock and Resources section - photos you can use for your art? they're awesomely handy) and practise drawing them (I'm thinking of people but that's only because that's what I usually draw).