I feel like I am educated and fairly high income (will clear $200k this year) but I honestly feel like I have no way to affect change. Contacting representativ

I feel like I am educated and fairly high income (will clear $200k this year) but I honestly feel like I have no way to affect change. Contacting representatives yields nothing but form responses, protesting has had no real effect. Volunteer work and charitable donations are about all I seem to be able to do and that's not on any appreciable scale. I honestly feel like I have no way to cause anyone to make changes outside of voting. Which, to be honest even when I vote I feel like my voice is not heard.