Nam Doc Mi Mango

Tomás starts with ...
I had a Nam Doc Mi tree that fruited in 2016, for the first time. The tree is located in the Virgin Islands. Hurricane Maria blew through in September of 2017 and snapped the 6" diameter trunk off around four feet off the ground, taking all vegetation with it. Near the top of the break it quickly sprouted branches and over the ensuing three years became an attractive tree. Only problem, no blossoms, no fruit. I recently pruned lower branches (quite low) primarily to reduce windage and am in hopes for fruiting this coming spring. I assume it broke off above the graft point if it is indeed grafted, and it is very healthy in every other regard. Any wisdom?