Put something like this outside your window or stick this onto the outside of your window. The reflectiveness of your window over a dark background makes it appear like a mirror so birds think the can fly through this „opening“. The sticker with the silhouette of a bird of prey will scare them away.
It’s not necessarily the predator thing that scares them away. The most important part is breaking up the reflection on the outside. The anit-collision stickers will work well for this. Look on amazon or at a local hardware store, they come in many patterns and shapes, just pick one that you like. You can also hang a couple old CD’s in front of your windows from fishing line. People do that where I’m at to scare off woodpeckers from their house and it should work for other birds too.