Your best option for brushes if you haven't already would be to tap on the plus at the bottom of the pixel brushes, then select Discover new brushes. This opens a large selection of options to choose from.
You could also try to create your own custom brushes.
As Sjanni said, go to Discover new brushes, Kyle Webster has a vast library of various brushes, some might be what you need. Not only that, there's a ton of people who sell brushes or have brushes available. Best bet aside from discovering what brushes are in the Adobe libraries, is to google Photoshop brushes
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