Now, that the mixers are banned from this forum, I wonder, why do we even need BTC mixers.
If you need mixer, you need mixer. The fact that forum banned it doesn't decide whether you need to use it or not.
1. If you have bitcoin which is connected to you and you want an untraceable one, you should:
Bitcoin is getting very decentralized. There you have blockchain analysis firms that can't even detect accurately whether your coins are clean or dirty, so, they can claim your coins dirty any time and you'll be forced to submit KYC documents, then they'll apologize by saying that it was a false positive. To be honest, I believe that over time blockchain analysis companies will improve their capabilities and accuracy. If you want to leave no traces, use just Monero, nothing else.