Got $6000 through Paypal!

Ask for a transferwise payment it's better

I only use PayPal with trusted clients. For new clients, I take payment with crypto.

Is your paypal account aged and passed through all the verifications and re-verifications?
Is your account getting ins and outs of money? Like regular cash flow?

If not on both above, best to withdraw your money to bank account, AND THEN remove the bank account.
I noticed that when a person refunds, paypal will take away your paypal balance, and if it's not enough, it will take from your card or bank account.

But if you don't have any, Paypal will eventually side you. Paypal won't bother with the other person's loss, so long as nothing is taken from them. Don't expect paypal to pay the complainant's refund, nah-ah, so if you don't have any funds or backup funds, they literally can't do anything to the person opening the dispute.

Just don't use them for hefty transfers. That's it.

use blackchain

I will suggest to offer a small % off and ask for crypto or bank transfer, and you will be in the safe side. You can ever ever trust Paypal.

Right. Don't mess with PayPal with funds like that.

Ask a friend/Family aka Gift payment. They cant be refundable. I received more than 100k € 0 dispute.