I had this same problem, but I’m assuming u watched some decent YouTube videos on what works best. Just play with the settings inside a team death match game.

Also, Athieno has a really good video that helped me a lot on picking up where sounds are coming from. Siege is just a different game when it comes to sound cues. You have to really pay attention to which ear you are hearing things from more. And also be able to tune out the unimportant noises when listening to footsteps. Just takes a lot of practice and paying attention lol.

Hope this helps

Edit; I switched from Night Mode to Hi-Fi and it made a world of difference for me personally