Todays privacy technique :
- Disposable address
- Whisper address
- CoinJoin & PayJoin (coordinated & P2P)
- CoinSwaps
- PayNym
- Coin Control
- Loop in + Loop out (transfer between layers)
- Using Taproot for multisig TX
- Confidental TX (Liquid)
- Lightning Onion Routing


TBD ? :
- Teleport TX
- BOLT 12 Blinded Path
- Point Time Locked Contract
- Taproot Channel (not widely developed)

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MWEB and Confidential Transactions.  Hopefully coming soon to Bitcoin after they activated on Litecoin and are proven to work very well.

I'm interested in learning about on chain and layer two projects that are trying to improve bitcoins privacy. Protocol changes, not wallets or mixers.