Is there any decentralized mixer? It is not always easy to hide identity when doing btc transactions and direct p2p mixers would facilitate that.
Not directly a p2p mixer, but coinjoin probably is what you are looking for.
This is a method to combine multiple transactions (from multiple senders) into one large transaction to obfuscate the the recipient.
Wasabi (
https://github.com/zkSNACKs/WalletWasabi), a desktop wallet for windows, linux and mac, has this feature included.
Currently the minimum amount to queue for coinjoin is 0.1 BTC.
In this process, there is no centralized entity which is required to be trusted.