Calling your representatives is one of the best ways to make your voice heard in a low-lift and consistent way. Elected officials keep track of how many people call about each problem. So if one problem is getting a lot of calls, it may make them think more about that problem.
This can be tough for neurodivergent allies who are not as comfortable speaking on the phone or unknown situations without being properly prepared. This is a helpful guide created by Autistic Self Advocacy Network that walks through the entire process, provides scripts, and other helpful tips.