You need to set the player movement speed slower like BF1 & BFV

@Zhukov211 Do you know what made BF4 so successful?
They had maps that provided lots of concealment and cover, and not huge amount of open "shooting" range flat lands.
I know of only one way successfully slow down the game, and that is to enable friendly fire, and to disable 3D spotting. But the design state of battlefield even makes that impossible.
This is the Battlefield title made of left over Battle Royal components, and this is nothing that can be fixed easily, if at all.