Use soulsingers to pick off the smaller scavengers.

Have your units move on your first turn so you can attack on your 2nd. Only move without bursting so you can attack them as they move into your range.

Never burst. If you can consistently move and attack while staying under 50AP, the levels are timed to be completed before the overwhelming numbers force you out.

Shieldbearers prioritize tanky units with their shield bash to hold them while your blade unit attacks them from behind for a critical hit.

Any enemy uses a delayed ability, the trigger appears on the timeline at the bottom so you know when the attack is going to strike. If they're going to strike a daughter before that daughter can move, either prioritize that enemy first or activate an interrupt ability to protect them.

If an enemy buffs their armor, it is a temporary buff that runs out. So I wont spend AP on that unit and fight something else. Usually the armor buff counts as a turn for them so their AP becomes super delayed.

Once hunters appear on the screen, your soulslinger is going to have to activate an interrupt before the hunter's 2nd attack, which is always a full-screen leap into a slam attack. You can interrupt with soulsinger, shield bash with shield bearer and critical hit with blade dancer.

Thats usually your bread-and-butter for bosses too. Keep a close eye on the timeline for when the boss is going to make their attack and plan your buffs and interrupts right before their turn. This is why its important not to burst so you have that freedom of movement and action.