Easy answer, stop trying. Let go, let God. You need to shine as a beacon on a hill or as a light in a dark room. Preach less and pray more. Your best witness and testimony is your life, the fact that you love and deeply care. Radiate God rather than rant about Him. And more than all of that put together is the power of prayer.
In this God wants what you want, you need to work together as a team. 1 Corinthians 3:6.