your not peaked at 660 660 is not a peaking number keep playing keep growing youll get better
Peaking At 660?
Is it possible? Of course it is possible - I am the living proof it is possible. 660 is where I will likely stay.
What makes you say that? If you want help, I can help you get better, but based on your stats I see no reason why you think you will stay 660 forever.

Have you peaked? That depends on how much you have studied (not played, studied), and how much you are willing to study.
I've played for over 50 years in clubs all over the world, and I have never known anyone who couldn't get to 1500. However, in virtually every case it required serious study, and usually for a few years. When I see a rating of 600, my assumption is that the person hasn't really studied yet.
You started a5 1900. Your argument is completely irrelevant if you start that high.
I have played 464 rapid games on this website and I am still rated 1900. I started at 1600 and then I won a couple of games and I was immediately rated 1800-1900. Even if you believe that first 5 or so games were flukes, you can't explain how I am still rated 1900 after 400 games by believing that I am not 1900 strength. If my strength wasn't actually 1900, I wouldn't be rated 1900 after 400 games. I had started playing chess before I made an account on chess.com that's why I was immediately rated much higher than beginners, because I played on lichess before I played on chess.com and I improved my chess by playing on lichess.
You missed his point, completely.