I have many flowering plants on my property that produce flowers for a season or two and then fail to bloom again--azaleas, rhododendrons, and hydrangeas predominently. We live in Massachusetts. We have many oak and pine trees on the property as well. Could that be the problem?
Failure to Bloom
Certified GKH Gardening Expert
Have you pruned lately? Sometimes this affects blooming.
These articles should help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm