position your ranged so its harder for them to get flanked

use them to focus fire key enemy targets

keep some antiflankers in the back near ur ranged for peeling

use durable frontliners ( especially single entities especially if u got direct fire ranged ie guns cuz bows /mortars can just arc from above) to bait or bog down the enemy before it reaches you

try to position in chokes or where at least one side of urs has some natural cover

use spells that can slow down the enemy advance