The problem is that at some point, you'll have to spend the coins, and at that point you will need to be extremely cautious to not consolidate any coin, as that would de-anonymize them. That's why mixing through your own wallets isn't recommended; here coinjoin comes, which is essentially grouped consolidation, and achieves that.

So, if custody is an issue, I'd recommend to using Whirlpool via Sparrow. There's a great guide: https://sparrowwallet.com/docs/mixing-whirlpool.html