Looking at your lines, I feel like I can't tell you much new. You clearly know the drill, you orient yourself at a functional underlying construction and find clear and deliberate lines to depict the reference.
Also the feeling of not knowing what to focus on, to push past the plateau sounds eerily familiar. You could always go back to some fundamental practices and see, whether you can squeeze a bit extra out of them. About a month ago I returned to depicting all the masses strictly as boxes, and found some extra inspiration into how to perceive the torso, and it gave me a new kick, that lasted almost two weeks, but then the novelty petered out again.
In the end, it's probably about cruising the usual youtube recommendations and look for stuff, that sounds weird on first view and trying it out. At the moment I am more into running music on the headphones and letting my pen go through the motions while the references pass by.
I wish you and me and everybody reading this lines a lot of inspiration.
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