How to get movement on fastball

My two seam fastball does not move anymore. It is flat. Also my four seam used to have run on it, but doesn’t anymore either. What are some suggestions to get movement back?

You’ve changed anything in your technique during the time it had movement and now?

I have the same problem. My 2-seam fastball has no movement. It’s just a slow fastball. :frowning: