Assalamualaikum,
Here's a story for you.
One group of friends are at a restaurant waiting for their dinner. Then another group of friends come to the same restaurant and sit down a few tables away. While waiting for their food, the maghrib azan is heard from the nearby surau. Since the food didn't arrive yet, a few people from the 1st table decide to go pray at the surau. Just as they're about to get up, the drinks come, so they sit back down. One of them while sipping on his drink, glances over at the other table. To his surprise, no one was there anymore. There were food and drinks on the table, but no people sitting there. They had all gone to the surau for maghrib. Feeling a little embarrassed, he and his friends too decided to go pray at the surau.
Lesson of the story, sometimes we don't need to say anything to encourage people to do good. Sometimes leading by example is the best form of da'wah.
"O ye who believe! Why say ye that which ye do not? Grievously odious is it in the sight of Allah that ye say that which ye do not."
Al-Qur'an, 061.002-003
Al-Qur'an, 061.002-003
