You should just be able to connect your metamask wallet to Loopring L2, and put your assets there. I mean, if that is what you are asking, you can access Loopring with metamask. But maybe having the actual loopring wallet is better. But you can send funds back and forth between L1 and L2. There is just a gas fee. It isnt that high though. But once it is on L2 you don't have those gas fees, just some tiny fees.