One of the biggest issues we deal with for our clients is simply the amount of time it takes for citizenship appointments, applications, etc. to get processed. Many feel powerless to speed the process up, but you can actually do few things you can do TODAY to push it along!
(1) Contact the National Visa Center, do an inquiry, and find out where they’re at with your case interview: https://travel.state.gov/content/travel/en/contact-us.html
(2) Contact the actual U.S. Embassy of where the appointment is scheduled, and see if you can also document your conversation with them.
(3) As a petitioner, you can contact your local U.S. Congressperson. The U.S. Congressperson has a liaison with the Department of State and can push these interviews as well.