The key is the approach.
First, you must be an informed Catholic and know the Biblical references for the teachings of the Church.
Anti-Catholics have spent the last 150 years inventing lies and misinterpretations of Catholic beliefs and practices.
So, study Catholic Apologetics and keep studying.
Second, it is most effective to be aware of opportunities to “evangelize”, rather than intruding on strangers, who have no interest in your zeal.
If you’re informed, you can gently correct misstatements, by those critical of Catholicism.