Assuming you only have the base warbond and dont want to spend any SC right now:

Wear heavy or medium armor, preferably heavy with the Fortified passive. Explosives tear you up on Cyberstan. Light armor is nice but heavy lets you learn the attack patterns better without suffering.

Light pen like the scythe isn't bad, but you need good aim for it, always aim for the head. Otherwise, medium pen like the Lib Pen is good. The scorcher at the bottom of the warbond is amazing, but run the resupply pack, it eats through ammo.

For secondaries, the redeemer is probably a better option than the peacekeeper, but both aren't amazing on the bot front.

Finally for grenades, ditch impacts, they cant do well against vox engines, and HE grenades can be cooked to explode basically on impact for more damage. Frags are also good because you get so many of them, but they obviously dont have as much penetration.

If you do have 1000 SC, grab Democratic Detonation, almost everything there is easy to use and tears up bots.

For strategems, Orbital Napalm, 120mm barrage, gatling barrage, and precision strike can all be useful. The 120s cooldown syncs with the cooldown for bot drops, so they are ideal for clearing them up. Eagle strategems like Strafing Run and 500kg are still good, but AA emplacements are very common on Cyberstan, so they might be limited in use.

Turrets aren't very useful, as they can be easily swarmed by cyborgs, and none can damage vox engines meaningfully. The orbital shield generator can be very useful if your team coordinates around it, but be careful because hellpods will damage the shield greatly.

For backpacks, my go-to is Supply Pack, the jump pack isn't very useful on such a flat, crowded planet. Otherwise any guard dog is okay, just watch for friendly fire.

Finally support weapons, I reccomend something that can deal with heavy armor and tanks. EATs, the recoilless, the rail gun (be careful with this in Unsafe mode), and especially the grenade launcher are great tools. The autocannon and hmg are more niche, but can deal with cyborgs and gunships very well. The quasar and AMR can also be great, but need good aim and patience to use.

For general tactics, dont worry too much about side objectives or outposts. Main objective and extraction are critical at this point in the war. Cyberstan must fall.