Let's be honest, this doesn't look like a cover shooter in the slightest.
Most games end up being a vulgar brawl, With players running (and turning around) like hares everywhere, practically always in the open...
I think it would be appropriate to greatly enhance the echelon class, specializing it in extreme mimicry and motionless play, making it absolutely lethal against moving opponents, making it almost impossible to see, unmarkable when immobile.
An authentic "ghost" to face pusher players.
Introduce severe handicaps to aiming for players on the move and standing (less for the assault class) and bonuses on the magnetism area for those stationary crouching or lying down and most importantly, reducing the movement speed of the characters until they are realistic, because they seem rabbits, rather than humans with 40 kilograms of equipment on.