Awww, it's funny but it's also REALLY SAD! I hope that this feeling toward your art was only passing, because it's not true! You may see no growth but I do and I'm sure a bunch of others do too! Your style has stayed recognizable and consistent, but that's different from lack of growth.
If it does trouble you, maybe completely changing your style would do something for you. And I don't mean adopting an anime style or realistic style, I mean reworking your methods and everything, focusing on different aspects of your technique, seeking different results in terms of mood, stylization, composition etc.
I think it is great with how you have grown though, with just doing your thing~