What can I do everyday so that I build a habit of giving my opinion more importance than the opinion of others?

This question is a reflection of the fact that, you might be always going into comparison between what you say and what others say about any topic. Comparison is not a good thing, it either results in jealousy or it invokes your ego.

Be careful and stay away from comparison.

We need to state our opinion, whatever it might be and at the same time have respect for others opinion.

The above explanation is nothing but the attitude each of us need to develop within ourselves.