They do same hard at first s skill up your tactics.
First, look for any moment to shovel or push an enemy from a height. For the big spider, when she is on a web bridge, what if that web bridge broke? She would take fall damage. Bust up her eggs before hand. Scout and sneak around to understand the environment.
Use consumables. Dip your weapons, poison your blades, etc.
Make sure to buff weaker party members with spells.
The best spells are not that ones that do damage but the ones that control a situation. A well placed grease, sleep, darkness, fog, etc all make a big different.
Look in the area for things to break that can crash down on enemies. Take out guard tower stuctures so enemies fall.
Break line of sight from ranged attackers or blind them with fog.
Tank the beefy melee enemies and use strong DPS on weaker ones.
Get to higher ground and keep enemies from going up.
Placing hazards on the ground will cause enemies to avoid them.
Keep the party close together but not so close they get hit with area of effect things.
Try to get suprise rounds.
Lure enemies into areas that you have the best positioning in.
Try to unchain/split sneakier characters from the group and have them in stealth.
Use bonus actions to fall back and hide.
Find cover.
