Q.Have I Killed My Japanese Maple?
Reported around 6minths ago, maybe longer. Has not started to regrow. Did I make a mistake?

Certified GKH Gardening Expert
You can tell if it is still alive by scraping off some bark from the trunk or a stem. If it is green underneath, it is still alive. Did it have winter protection from cold winds or excessive cold? It may have suffered winter damage. These articles should help:
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-winter-damage.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maples-in-containers.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-feeding.htm