It does sound like too much shade is a factor, though bulb crowding might be a contributing element as well. They can be dug up and divided (after they go dormant) if clumps have become dense, but the better long-term solution may be to move them to a much sunnier site in the process. Indeed, a few feral (garden escapee) clumps of daffodil to grow and bloom in wooded areas on occasion, but when they do so, they tend to get more light than we might assume. Growing bulbs under a deciduous tree tends to give them more opportunity to photosynthesize than under an evergreen tree like pine.

Spring-flowering hardy bulbs like daffodil and hyacinth also require a minimum winter chilling period in order to form flowers inside the bulb, but even in Wicomico County, you probably get enough cold in most winters.

Bulbs are low-maintenance perennials in that yes, they do not require fertilizer or much in the way of annual tending (foliage should die back naturally after flowering and not be clipped off until fully dead). If the plants are in a location that happens to receive fertilizer runoff from another source, like a lawn, the nitrogen (N) content of the fertilizer might be suppressing flowering, since plants use nitrogen more for foliage growth than blooms. While occasionally a phosphorus (P) boost seems to encourage flowering, unless a laboratory soil test reveals a soil nutrient deficiency, adding more should not be necessary.

Miri