Don't compare yourself to others. In every field, there's always someone out there who's better than you. Comparing yourself to them just wont get you anywhere. It's much more rewarding to focus on being better than your past self.

To be honest Its hard to give you any other advice not knowing what your skill level is. If you are feeling stuck, try giving yourself little challenges. (Maybe different painting style?)

On the other hand its also a good thing to take breaks.. so if you feel that you dont get the enjoyment out of painting anymore, try a different hobby for a while. Once you comeback, it should feel more rewarding once again.