You can achieve reasonably anonymous payments through use of good opsec, and by utilizing CoinJoins: https://en.bitcoin.it/wiki/CoinJoin

Wasabi Wallet has built in trustless coinjoins, routed through tor by default: https://wasabiwallet.io/

Samourai Wallet has similar features, requiring a much smaller amount of coins: https://samouraiwallet.com/

I assume anyone competent enough to hang on to this amount of bitcoin is already doing this.