Location Rhode Island. Sun/part shade. Mild winter except for a couple of days of 0 degree nights.
Try using a fertilizer recommended for azaleas and camellias. This article should help:
https://www.gardeningknowhow.com/ornamental/shrubs/japanese-andromeda/grow-japanese-andromeda.htm
I put a thick layer of fine bark and clipped off all the blooms because I didn’t want them to fall off and mess up the fresh bark.
The loss of the blooms may have shocked it. Keep it watered and it should perk up.
https://www.gardeningknowhow.com/ornamental/shrubs/japanese-andromeda/grow-japanese-andromeda.htm