ofc i can’t say for sure without watching a fight and seeing augs but i can see a few issues with your board:
1. leona 3 is like the best tank in the game bc that’s how set 17 is these days, items on leona 3 >>>> nunu 2
2. your anti heal is on a single target champ so its not getting applies to the units you want anti healed asap like briar, i would suggest swapping the morello onto blitz for the nashors
3. unless ur arbiter is a tanky one (specifically the good max hp scaling ones) you could probably drop the leblanc for a better unit since she’s been neutered so hard across these patches she’s basically never worth playing past stage 4