Copy designs you like, and keep a couple of CSS files +/- web components that you can carry along with you from project to project. Tweak then as you go.
Like everything else, getting good at making designs that you like will take time and effort, so if you want you get good at it, do it! I find it fun, and my designs aren't to everyone's taste (I too like black tshirts), but whatever.
Plus, getting good at making designs that i like has made me better at making designs clients/projects will like, so, win/win.
I still get block messages in Vivaldi, but not Firefox.