The Ghost perk isn't needed if you're in a squad. Overkill is a godsend when you think you could use a Sniper and your other favourite assault rifle or SMG. Don't knock Overkill.
I've seen players online decimate without heartbeat sensors, it really isn't needed.
My advice, join a clan. If you don't like a clan, quit and join another. Get a mic, communicate, and work together.
Ensure you have your audio set, (My music is at 0 for Warzone, and voice is @ 80), set your general settings. Like sensitivity, also I don't use vibrate as when getting shot it's irksome and can affect your aim when shooting back... things like this.