Be aware of your flaws – but for most 'cognitive biases' it's enough to be aware you have flaws. You can't get the right answer by taking a guess and doing a 'anchoring adjustment' to fix an anchoring bias. That's not how truth works! And it's a ludicrous vision of how people ought to think.
You fix the error the same way we noticed it to begin with: by slowing down, remembering how easy it is to make mistakes, and answering carefully. Imagine many very specific ways things could be and think about which ones might be more likely and why.
As a brief aside, citing a bias incorrectly, and using it to make a decision... Don't do this, please. It makes me physically hurt, in my bones. If you can't articulate the difference between sunk costs and being pot-committed, please don't mention either (although, if you understand it even without the names, you're obviously fine – vocabulary is the least important and most annoying element of this discourse).
We can all do better. This is an area of human curiosity that will have almost no value in that process.