Strategies for Identifying US Philanthropists for Flood Relief Efforts

Hi everyone, I’m trying to generate a list of people in the United States who have a history of philanthropy. I’m trying to get support for a relief effort for the flooding in Western North Carolina, and direct them to this website - https://www.connectcarolina.org/ and would like to create email campaigns to reach them. Any tips/ideas for how to do so efficiently? Thank you in advance!