Often, the best way to get people into effective altruism is simply to learn more about their interests and skills and talk with them face-to-face.
If you're part of an EA group already, check out this guide to running 1-to-1 meetings, which explains the best ways to meet interested people and share information they'll find useful. If you want to make this a regular activity for your group, consider applying for funding from the Centre for Effective Altruism. (For example, CEA can send books to share with people you've met, or reimburse your group for money spent on small events and 1-to-1s.)
To learn about the potential impact of this activity, see EA Berkeley’s 2016 review of the value of coffee meetings for recruiting new members.
If there isn't an EA group in your area, 1-to-1s can still be a good use of time; consider arranging meetings with people in your community who might want to learn more about effective altruism. These can be friends, students at a university, co-workers, or anyone else who might take to the ideas. (Just make sure they know in advance what you want to talk about; donating money can be a sensitive topic.)