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Don't coin join if you ever want to sell it on the exchange again. You'll likely have trouble.
You can send the coin joined UTXO back into your wallet, but make sure you send it to a new address.
So what would you recommend then if I did want to sell one day on an exchange?
Use an exchange that has the lightning network. Move it around between a few LN wallets or swap out onchain.
BTW, I think it will probably be ok if you use a coinjoined UTXO to open a LN channel and send sats back into an exchange that way.
Don't coin join if you ever want to sell it on the exchange again. You'll likely have trouble.
You can send the coin joined UTXO back into your wallet, but make sure you send it to a new address.