Problems with some images (Patreon)

Hey everyone, I've just noticed that some of the images I've been posting are being compressed by Patreon so they look worse than the originals, with less color and desaturated.

This makes me look very bad and makes my works much less attractive.

I'm thinking about a solution for this, probably in addition to the images of the post I'll have to attach a zip file with the same images included.
This will probably be annoying (for me mostly) but I'm not sure there is a better solution.

I accept any suggestions...