Atomic wallet is a closed source wallet, there are good wallets which are open source and you can use it to hodl your coins. What you are doing is a very bad idea, staking your coins in a centralized exchange, first, you risk your money hodling it in a stablecoin and secondly, you risk your money hodling it in an exchange, because no keys, no coins. If i were you i would use that money to buy Bitcoin and move it into a hardware wallet, but i am not you, so do as you please.