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Linea and Ethereum are networks of different layers, so you cannot just transfer the same crypto directly between them. That is what makes many crypto operations complicated. You can look for a P2P exchange and swap your ETH through other holders with a fee, or you can use bridges that allow you to move ETH from Linea to Ethereum. For example, this one: https://defiway.com/bridges/bridge-eth-linea-ethereum . The fee will also be there, but in my opinion it is lower. And with bridges you can swap at any time, while P2P requires you to find someone to trade with. But choose whichever option is more convenient for you.