Run your own nodes. Bitcoin on i2p and tor, lightning on tor.

Don’t talk about your stack.

Use sparrow wallet for coinjoin connected to your own wallet. Once you have “enough” mixes, sweep to cold storage. Your utxos are as private as the lowest anonymity set. I’ll assume you know about utxo management since you self custody.

Once blinded paths are more common, send bad bank utxos to boltz and send them to your lightning node.

If you need to, trade your Bitcoin for cuck bucks on a DEX or local meetup. The people with guns get suspicious if you start buying a lot of stuff you couldn’t possibly afford.

For bigger stuff, I don’t know because I lost all my Bitcoin in a tragic accident but maybe you gamble at a casino or start a charity or church, perhaps in another country.