I think this Facebook discussion could be really useful for you. It includes both my personal impressions of how to do outreach (which is fairly highly upvoted, suggesting that other people share my experiences to some extent) as well as links to longer, more sophisticated investigations done by other EAs and EA organizations.
https://www.facebook.com/groups/effective.altruists/permalink/963258230397201/
I think this Facebook discussion could be really useful for you. It includes both my personal impressions of how to do outreach (which is fairly highly upvoted, suggesting that other people share my experiences to some extent) as well as links to longer, more sophisticated investigations done by other EAs and EA organizations.