I'm curious to know what is the best way to coinjoin my dollar cost averaging UTXOs?
I have about [snip] BTC now in UTXOs after a few years of averaging.
But they are all from Coinbase.
They are of varying sizes.
First of all, i recommend you not to disclose amount of Bitcoin you have since it could attract hacker and scammer.
While i mostly agree with @PrivacyG, be careful you may lose a bit of privacy if your UTXOs belong on multiple address with different usage. If you're willing to pay more TX fee, you may want to consider consolidate on few TX. For example, consolidate from multiple address with same/similar usage.
And what if I only want UTXOs that are larger than 0.02 in my cold storage?
After re-searching Wasabi docs, such exist doesn't seem to exist. And it seems you still can't manually choose UTXO used to perform CoinJoin either. So you need want to monitor CoinJoin process and stop it manually when it start creating UTXO with balance lower than you desire, but CMIIW.