Speaking out is the very core of democratic participation. But there’s more. More ways to speak out, and more venues to hit. People and places to visit and support. Here is a growing list in progress of places to put your energy and passion to work for a strong and righteous America. (in no particular order).
Human Rights Campaign: Take Action
Human Rights Campaign: Volunteer
Act Blue: Contribute to Democratic Candidates
Fitness for the Occasion 
I’m a lifetime member of the Southern Poverty Law Center. Somewhere around their building is a brick with my name on it (not supercynic, but my real name). I’m glad to see that it made your list.