How to handle moving your assets from a hacked metamask wallet

Hey everyone, sorry but this will be a long post: I recently got my Metamask wallet hacked for some reason, and I would like some help on figuring out how it was hacked , and how to move my tokens to a new wallet. I'm kind of experienced in the crypto world, so I wouldn't make mistakes like sharing my passphrase or putting it in my PC, clicking on phishy links, etc. I even looked up my MM permissions on revoke.cash and I had unlimited spend enabled on Uniswap only. Are there any other ways I could have got my wallet hacked? 2) Thankfully the hacker didn't care much about my tokens( or most likely didn't notice them at all) so I took all my USDC and USDT out from the polygon and arbitrum networks. My issue lies in the Eth mainnet, I mean I don't have much money in tokens there(less than 40$), but I still would like to move them out, even with fees being so high. I also would like to move all my NFTs from pologon to a new wallet. So is there anyway to batch-send tokens and NFTs on ethreum mainnet and polygon? 3) Could you please offer some advice on how to protect myself from MM hacks? I'm really stressed out, like I'm trying to install linux alongside windows to protect myself from viruses and whatnot, and it feels bad getting your hard earned coins robbed. 4) I have some ETH tokens that I couldn't sell on Uniswap before getting hacked due to low liquidity. Is there anyway to know when a token can be easily tradable on Uniswap? The ones I'm talking about average 3k-5k trading volume a day on Uniswap, which is pretty low I guess. I just don't want to send some eth to my wallet and have it trapped there(cause of the fees) for the hacker to steal. Thanks in advance