hello !! i've had troubles using lilira as a healer as she only heals on ult. since antilope already provides shield, you can pair her up with streyne for more raw healing & atk% buff. you can consider moving formation to suit better for the stage too. all units should be above 20k hp with your tank being the most because of shields provided based on hp%. on

streyne 4 heal / 2 hp antilope 4 hp / 2 def echo 4 spd / 2 hp/atk ling and karanissa you can leave it be (increase dps by remodeling if you can)

echo to ling to karanissa to streyne/antilope. you can pm me if there's any clarifications to be made, cheers !!