I have a few ideas for the game.

Perks.

Assult: Shock Advance
Assault operators capture objectives, arm explosives, and disarm enemy explosives 30% faster. Successfully completing any of these actions grants the operator a 20% movement-speed boost for 5 seconds.
The effect triggers once per completed action, allowing aggressive Assault players to rapidly move from one objective to the next.

Adrenaline Surge
When the Assault operator's health falls below 40%, they enter an adrenaline state, increasing their weapon damage by 10%.
The bonus remains active until the operator is revived, healed above the threshold, or eliminated. The effect encourages Assault players to keep fighting under pressure without making low health completely risk-free.

Combat Resupply
Whenever the Assault operator resupplies ammunition to another player, they receive a temporary 15% movement-speed and 10% weapon-damage increase for 6 seconds.

Support:
Drag & Revive
The Support operator can revive a downed teammate while dragging them to safety, eliminating the need for a defibrillator. The revive takes significantly longer than a standard revive and leaves the Support operator vulnerable while performing it. The ability allows medics to recover teammates from exposed positions without simply standing over them in the middle of a firefight.

Field Resuscitation
Successfully capturing an objective, arming an explosive, or disarming an enemy explosive triggers an emergency medical pulse.
All downed friendly players within the objective's immediate area are instantly revived, with their revived health equal to the Support operator's current health.
This can turn a successful objective push into a dramatic squad-wide recovery, but requires the Support player to be alive and actively contributing to the objective.

Last Stand
The Support operator's bleed-out timer no longer expires.
Once downed, they remain incapacitated indefinitely until a teammate revives them or the entire squad is eliminated. This makes killing an enemy medic an important priority, while giving the Support player a chance to be recovered even after an extended firefight.

Engineer
Reactive Maintenance
Whenever the Engineer repairs a vehicle, they automatically deploy an anti-tank landmine beside the vehicle.
Only one mine can be generated from each repair action, with a short cooldown preventing the Engineer from creating an unlimited minefield.
This turns vehicle maintenance into a defensive opportunity, allowing Engineers to protect damaged vehicles from enemy armor attempting to finish them off.

Overhauled
Entering a vehicle temporarily overhauls its systems, granting the vehicle increased maximum health and weapon damage.
The bonus lasts for 15 seconds after the Engineer enters the vehicle, allowing Engineers to briefly turn damaged or outmatched vehicles into dangerous battlefield assets.
The effect ends when the Engineer leaves the vehicle and cannot immediately be reapplied by re-entering it.

Rapid Response
Every time the Engineer is revived, their vehicle repair speed increases by 15%.
The bonus stacks each time the Engineer is revived, allowing a repeatedly downed but recovered Engineer to eventually become an extremely efficient battlefield mechanic.
All stacks are lost when the Engineer dies and respawns.

Rapid Response
Every time the Engineer is revived, their vehicle repair speed increases by 15%.
The bonus stacks each time the Engineer is revived, allowing a repeatedly downed but recovered Engineer to eventually become an extremely efficient battlefield mechanic.
All stacks are lost when the Engineer dies and respawns.

Recon:
Hunter's Mark
Whenever the Recon operator eliminates an enemy, enemies within a short radius of the victim are briefly highlighted through walls.
The highlights are also transmitted to the Recon's squad, allowing the kill to immediately reveal nearby enemy positions.

Ghost Shot
Scoring a headshot kill temporarily reduces visibility for recon.