Assalamu Alaykum,
Q. 1) What can I do for Islam?
Q.2) what can I do to better my ummah?
jazakallahu Khair

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A1. Be the most excellent Muslim you can ever be. Submit yourself to all the teachings without  second guessing yourself or Islam and its contents.

A2.Be the best Muslim you can ever be. Be firm on religion and never let others fool you once you have made a good righteous decision established through Quran and Hadith. Note well: sometimes  seemingly good people work for shaytan, stay away from them. This would a contribution to yourself and the Ummah. The Ummah wants winners, not wishy-washy people. We have plenty of them. One less would be a great blessing from Allah (Subhanahu Wata’Ala). You can do this for starters to better the Ummah.

An added note: Islam is about people first  reforming themselves, then their families, thereafter the Ummah at large. For starters,  perfect your Imaam. The rest would follow insha-Allah, Ameen.

Allah Certainly Knows Best.