The price of Cosmos (ATOM) after listing on Binance has not increased, but quite the contrary. I don't think this token is overrated. I think ATOM has a great future. The team has been working on the project for several years and is steadily moving towards the planned goals.
The initial listing of Cosmos (ATOM) carries a huge hype within it, reason why it is overbought that time and start to decline in price when hype diminished. I also agree that ATOM have great future with a hardworking devs, they will surely surpass their previous ATH.
Just have patience, every coin market cycle have bear period in it. You just need to buy on that time.