Do you have any idea if it blooms on old or old&new wood? If in old wood only, you may not get blooms on years when the old stems die off during winter. In that case, consider using winter protection techniques when it goes dormant in the Fall.
If it still has those round fertilizer pellets, do not fertilize it this year. Amend the soil with garden sulfur or aluminum sulfate if your soil is alkaline. Keep the shrubs well mulched 2-4" up to the drip line (do not use rocks as mulch).
And keep the soil as evenly moist - not wet- as you can. A 1/2 to 1g of water per plant per watering is fine in Spring but tweak in the summer & fall.