Q.My Potted Bougainvillea Has Stopped Blooming. How Can I Get It To Bloom Again? It Looks Very Healthy, But No Blooms! It’s Not
b lank –I want to get the plant to bloom again!!!

Certified GKH Gardening Expert
They are supposed to thrive on neglect so it is frustrating when they don't bloom. The bloom time is cyclic; they don't bloom constantly like annuals. Make sure you aren't overwatering and use fertilizer without nitrogen.
Here is info that should help pinpoint the problem:
https://www.gardeningknowhow.com/ornamental/vines/bougainvillea/bougainvillea-not-blooming.htm
https://www.gardeningknowhow.com/ornamental/vines/bougainvillea/bougainvillea-in-containers.htm
https://www.gardeningknowhow.com/ornamental/vines/bougainvillea/bougainvillea-pruning.htm