Answer:
"You can increase the impact of your efforts by reaching out"
Step-by-step explanation:
1. "You can increase the impact of your efforts by reaching out" of the sentence contains the subject and the action. Here, "you" is the subject while "reaching out" is the action.
2. I might take this action because I'm really serious about this cause. This can be inferred by the first part of the sentence.
3. I might takes this action by reaching out to an even larger audience and people. This can be inferred from the last part of the sentence.