Too much shredded onion in my hawaiian mac salad

Having a BBQ tomorrow and tried making hawaiian Mac salad. I followed the recipe as shown with the exception of the onion. I shredded about 3/4 of an onion. Now it tastes way too much of onion and not sure how i can fix it other than by doubling the recipe which will likely be too much food for my bbq tomorrow.

Recipe:

1 box of macaroni noodles

3 shredded carrots

1/2 shredded sweet onion

dressing:

2 cups mayo

1/2 cup whole milk

1 tbsp apple cider vinegar

1 tbsp sugar

salt and pepper to taste

Anyway to fix this? Was going to add green onion tomorrow and will definitely not be doing that now. im hoping by letting it sit the taste will improve/mellow out but its pretty bad rn.