If you have 15 minutes, you can send a letter to the editor for a newspaper. Here are the newspapers to target. And here are a few example letters to get you started.
Research
Key resources for research for your letter are:
FDGA Press Release of July 8: This 27 page document covers the 20-year history of redistricting in Georgia and makes a case for reform
Split City Study of the FDGA Map room: provides examples of small-to-medium-size cities that could be accommodated in a single Congressional, state Senate, or state House district, but have been divided into multiple districts.