According to the big Indonesian dictionary, self-introspection is a review or correction of one's actions, attitudes, weaknesses, and mistakes. This introspection is very important to make yourself better. and prevent yourself from making the same mistakes.
Someone who has never realized his mistake, is someone who has never introspected himself. and believe someone will not make their lives better. always blaming others, looking down on others, feeling more powerful than others, that is a person who is not self-reflecting.
just be aware of your own weaknesses and strengths. and correct these deficiencies.