Imām Ṣādiq (ʿa) said, “You, a person in that community that doesn’t have any believers, are like an entire society, an entire ummah. But you have two responsibilities. First, remember and practice our teachings. Second, invite people towards us and our teachings.”
Learn from the knowledgeable scholars, ask questions to those who have studied, and do your best to follow that which pleases Allah (swt). This includes learning the proper way to pray, fast, speak to our parents, etc.
Those who love our Noble Prophet (ṣ) and saw the love and respect that he had for his beloved grandson Imām Ḥusayn (ʿa) wonder why did Karbala happen? The choices and actions Imām took for Allah, do we also take action for Allah?