What about CoinJoin? I advice you to try it. Easy method, use Wasabi wallet, you can send a CoinJoin transaction and you will receive new coins from an unknown address. CoinJoin is a wallet added feature to mix inputs from different senders and split into the output addresses. In simple words , You will receive btc from a different input from which it has originally sent.
You can always use Mixers as you can also use another anonymous blockchain like Grin or Monero.
CoinJoin doesn't send you coins from an unknown address, not exactly. It sends coins from a large set of inputs to a large set of outputs. The input set you're getting coins from includes your own inputs (keep in mind that it's trustless so your coins are sent and received in one TX and never leave your custody), it just makes it harder to prove which outputs are yours, depending on how many joins are there in the TX and what the amounts are. Wasabi tries to make the inputs and outputs identical in size so that also adds a bit of privacy but you can't mix amounts lower than ~0.1 BTC. Usually you need multiple rounds of CoinJoin to get a reasonable level of mixing. You also have to be extremely careful with what you do with change which is often an issue with Wasabi due to the 0.1 BTC minimum. Accidentaly merging change with clean coins can undo the mixing.
This is different from custodial mixing services that send you coins that are completely separete from your inputs and can usually handle odd amounts except chipmixer with its premade chips.