Use decentral exchanges (DEX) like bisq.network and deal only with signed accounts which have some months account age or with whom you dealt before. And better you do three trades with amount X instead of one trade with amount 3x. And accept the fiat payment only in case it's from the same person and account number as registered in the DEX. Otherwise return it immediately and don't release the coins.

Doing so you have no KYC and less risk to get involved into triangle scams where e.g.

A buys bitcoin from you for $ 500 and you give him your bank account number
A sells a washing machine at ebay to B for $500 and gives B your bank account number
B sends you $500 and you release the bitcoin
B then goes to bank and police because he never got the washing machine
Police comes to you because the first impression is you're the ebay fraudster
The outcome is you have $500 in bitcoin less, A has $500 in bitcoin more and for B it was just trouble but no money loss or gain.