To prioritize privacy, UTXO should be just larger than expected spend.

The worst thing for your privacy is to pay a 1mil sat invoice with a 100BTC UTXO and expose your wealth.

Have some UTXOs at approx:
-500k sats
-1mil sats
-5mil sats
-10mil sats
-50mil sats
-etc

Keep in mind CoinJoin sizing too