its much safer and cheaper to sell on Offerup to a local seller and meetup at a police station or bank, no fees either for Offerup.
ebay is generally safe but its pretty easy for a scammer to scam you or for someone to use a stolen account/CC to defraud you, there are things you can do to protect yourself - verified address, check the address on google maps, don't sell to new ebay accts, etc - but end of the day a small percent of sellers get ripped off.
Mercari is basically ebay for zoomers, i think some of them prefer using that site over ebay although fees are basically the same.
You can also sell on StockX, its a verification site so a buyer buys a PS5 from there, you send it to StockX, they verify its legit, they send it to the buyer and release the money to you. Its extremely popular with sneaker resellers but has a small market for nvidia cards now and presumably PS5s this holiday.
OfferUp is your best bet tho, the only thing is there are going to be a SHIT LOAD of ps5 resellers since the mentality nowadays is "lemme buy 2x of <insert hot thing>, I'll sell one and it'll pay for mine!" It tends to lead to massive and quick deflation as everyone tries to undercut other sellers.