4K; Black patent Dr Martens shoes hand crushes Nora rubber boots over bottomless pit

It's the return of Nora boots! I'm also using more green screen but I'm struggling to use it in such a way that it doesn't look sucky. You can tell in some shots that it doesn't really work as well as I would like. Do you think I should continue with YT-downloaded green screen or should I invest in a green screen material myself?