How much ETH do I need to move MATIC to another wallet?

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I was gifted some MATIC from an event a while ago, I guess I gave them the wrong address cuz I found this stash of MATIC in some side wallet that only has ~$4 of ETH. How can I transfer it out? I can't get any estimation from metamask for how much gas would cost, the option "next" where I would see gas is blurred out. Does this side wallet need more ETH? How much more should I add? I'm probably never going to use this wallet so I don't wont to waste too much money. Gas is kinda low right now so I want to try to get this done before it shoots back up.