CS2 skins P2P can be traded on many CS2 skin trading platforms. There are numerous sites where CS2 P2P skin trading is allowed, but you need to spend a lot of time searching for the right website.
Usually, CS2 P2P trading is done through Steam, which makes the process safer for everyone involved. Some websites let you log into your Steam account and do the transfer. Obviously, finding a reliable site takes time, which is why you must start as early as possible and do research until you find the best option.