We prefer to call our “legislators” our “public servants”. We choose them to represent the will of We the People in our legislative bodies. They work for US. Your public servants need to hear from you. Tell them where you, the constituent, stands on issues you care about. When contacting them, be professional, polite, and brief.
Our friends at Illinois Policy Institute have created an excellent resource page to find your legislators at this link:
https://www.illinoispolicy.org/maps/