You can’t see your own blind spots. That’s the point of asking people who can.

Blind spots are not things you are ignoring, they are things that do not appear to you at all, so trying harder to notice them does not work. The only instrument available is other people, who can see the thing from an angle you do not have. Most of them will not mention it unless you ask, because volunteering that kind of observation is awkward.

Ask two people who know you in different settings what you do that you probably do not realize you do. Then say thank you and write it down without arguing. If both answers point the same direction, you have found something worth knowing.