Too many blueberries is not exactly a curse.

I saw this on TV: maple-blueberry syrup for use with pancakes, ice cream
etc:

Reduce some blueberries to make a little syrup.
Strain and mix that reduction with some maple syrup.
Add some whole blueberries to the syrup mix.

Sorry I didn't get the proportions but it seems this would be hard to
screw up in any event.

If you have so very many blueberries, you can consider sharing them: at
this time of year, certain birds would enjoy having access to some in
your yard.

Best regards . . .