First time painting, Help with brushstrokes.

So I’ve tried thinning my Atom Olive drab, and I think it looks pretty bad. The images are the 1st/3rd/4th/5th coat. I watched the video of the guy painting the purple Warhammer door (or whatever that is), made a wet palette, but I can’t get the paint to shrink no matter how much water I add to it (I don’t know if it could be the issue here). Or maybe I just need more coats, but I find it weird because of this colour being on the darker side.

Any help is appreciated!!