When I'm feeling particularly stuck or unhappy with my drawings, as I am right now, I like to take a class, watch a video, or look at a how-to book. It takes the stress out of it a little. It's interesting to see how someone else approaches things and look at how I might be able to incorporate that into my own ways. A few months ago I started following Koosje Koene. I love the variety of her drawings. Every Tuesday she posts a super short little video called Draw Tip Tuesday. Her voice is so calming and I like how she edits her videos.
I also love the Guardian's How to Draw series which features children's book characters. I haven't really figured out their posting schedule but there's usually 4-5 each month. I like that they're written by all kinds of famous artists, so there's all kinds of styles and methods.
I also get how-to-draw books from the library every so often. I love the 20 ways to draw series from Quarry Books. I'm also fine with going to the children's section and grabbing a few how-to-draw books from there. I find that flipping through them and drawing from them for an hour or so can bring me out of a funk.