Best keywords to use for Nonprofits to find me in their searches?

Hey guys, since I have a 24 year old Autistic son, I would like to help local Nonprofits with their website needs and have done a lot of keyword research using Semrush and other tools but only keywords I am finding seems to be more suited for Nonprofits themselves to do their own SEO and not for an SEO or Website service trying reach the Nonprofits Organizations.

So which keywords can I use for the Nonprofits to find me in their searches please? Thanks. WordPress ...