Metamask Gas auto set to 516530

Hello guys, im getting very angry with that problem.
Im trying to sell a NFT on Opensea and when i accept the offer It shows me the gas of 200$, i tried to set up the gas limit to 21000 but it fails instantly, tried to put a bit higher 50000 and transaction failed(tried 3 times lost 3 gas ) can someone help me to set it right so i can make my transaction ?
PS to transfer ethereum i pay normal fees
PS2 I have other chains added on my metamask
thank you

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