Q.Why Would My Impatiens Stop Blooming After 6 Weeks Of Flowering In Part Shade Location? I’ve Used Miracle Grow
My property borders the woods The plants (impatiens) face east, but trees provide shade. Gets some sunlight

Certified GKH Gardening Expert
Are they getting sufficient water? When temps reach above 85 degrees F they need 4 inches a week. Have they gotten leggy? If so, cut them back by about 1/3. They should resume blooming in a couple weeks.
Review these cultural needs and see if they are being met. I usually supply regular water and a slow-release fertilizer a couple times during the year and they bloom all summer.
https://www.gardeningknowhow.com/ornamental/flowers/impatiens/growing-impatiens-flowers.htm