I try to keep all UTXOs over 10 million. I'm mostly saving so main focus is keeping things economical in very high fee environments (likely a couple decades from now).

Good target yes. Bigger always better.

I always try to estimate UTXO size to be at maximum 5% of whatever the highest miner fees are (think 2,000 sats/vbyte x ~180 bytes = 360,000 sats

5% of 0.0036 BTC would be 0.072 BTC UTXO size

Prob over thinking it but its served me well.