First few years after planting, the daffodils bloomed profusely. The past two, however, foliage emerges without blooms.
Why Would Daffodils Stop Blooming After 5 Years?
Certified GKH Gardening Expert
Here is an article that will help you that discusses why daffodils won't bloom:
It could be the bulbs are just taking a rest and are building strength so that they can bloom the next year. You could try digging up the bulbs and separating them and then planting them in a more spread-out way so that they will multiply and bloom better the next year.