Your UMAP Doesn’t Look Good
Sorry, but it doesn’t! But that’s OK, you just work in an industry that prioritizes quick results over aesthetics. The default UMAP plots from scanpy and Seurat are certainly serviceable, but no matter what journal you publish in, you deserve to have a clean-looking plot that more effectively communicates your data!
I know lots of people spend their whole lives perfecting data visualizations. I am not one of those people, I am just an opinionated researcher with a bit too much time on my hands.