If you are going to keep it, then keep it to your wallet. There's a lot of trusted wallet. Mycelium and Electrum is what i preferred most. You have full control to your funds because you have access to your private keys. Unlike exchange hot wallets, you don't have access to your private keys. Also exchanges and web wallets are not safe to use since they are the most prone from hacking causing the funds stole by hackers.

As i said, if you're gonna keep it for long time. Store them to your wallets and make sure that your decice is safe and protected with antivirus. Or better store them on cold wallet, hardware wallet like ledger or paper wallet and store them to safety deposit box.