How to get more blueberry's and grapes??

i'm offline and won't see your pictures but i would say from your descriptions that you have a lack of pollination. as to why that happened it is hard to say without being there during flowering.

songbird

OP, what kind of grapes, and did your grape vine have lots of rain?

Blueberries need fertilizer 2-3 times a year using a fertilizer made for Azaleas/Camellias, and the soil needs to be acidic.

This year , for the first time ever , my grape vine is loaded - fruit usually sets , but doesn't mature but for a few grapes . We had a very wet spring , unlike the last few years . BTW , I didn't planrt the vine , just realized one day it was there among the honeysuckle vines on my fence . The few grapes it has produced in the past had good flavor ... just weren't enough to do anything with .