Metamask is a place to store assets that we have, and can be used to store more than one asset. but to make swap transactions to get a drop, usually it can only be used once. and if you want to get another drop, then you have to use another wallet..
We are not store anything on metamask, we just unlock our wallet by providing the key, so we can interact with our assets on the blockchain. All our assets are on blockchain, not in metamask or another wallet interface.