How can I get more FPS

remove 180 actors.
That will help.

Depending on the amount of polygons per actor, that is highly usual to happen. One way is to optimize the LOD for each actor as 1st priority. If that took place already, then if you are using Displacement somewhere (landscape, actor materials) try to reduce the Tesselation Multiplier to lower numbers and give your material some awareness about the camera distance, so you can set a Tesselation Multiliper values higher for close to camera objects and lower values for the distance ones. Sometimes texture sizes affects performance, but that is really a matter of experience to set properly. Let me know if your are still aware of the tips above and need some more clues.

When I have many actors like 360 in a small place and I look with my player camera to that place my FPS goes down from 120 to ~63

You didnt mention the most important one.
Drawcalls.

Dude I made exactly what you told me and i got like 50% more frames thank you so much :wink:

Problem were drawcalls. Solution is instance static meshes.