Do you dead-head your roses? That is, do you clip the stem of a just-past-bloom to a five-leaflet growth? This will encourage the formation of new flowers.
I'm sure there are photos here at THG; please use the Search function on the upper left-hand corner of each page and look for phrases like "dead-head roses" or "dead-heading roses."
Happy gardening!
Cynthia H.
Sunset Zone 17, USDA Zone 9