People are better at identifying biases in other people than themselves, because when we look at others we see their behavior, but when we look at ourselves we have what seems to be a better tool - introspection. We can explore our own minds, examine our own motivations, and thus determine if our motivations are appropriate. However, in reality introspection is actually a very poor method for highlighting bias, our own biases are a major blind spot for introspection.

The best way to identify your own biases is to step outside of your own head, and to try and imagine someone else doing exactly what you are doing. Would they appear biased to you? The answer may be more accurate than the normal approach.

https://scholar.google.com/scholar_lookup?journal=Journal+of+Experimental+Social+Psychology&title=Valuing+thoughts,+ignoring+behavior:+The+introspection+illusion+as+a+source+of+the+bias+blind+spot&author=E.+Pronin&author=M.+B.+Kugler&volume=43&issue=4&publication_year=2007&pages=565-578&

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7546453/