Hello, I am new to Bonsai and have been doing a ton of research and have gathered my materials and have even shaped a couple of small beginner trees. My question is about my Japanese maple I was gifted. I need help getting the trunk to thicken and establishing a strong nebari. I got over zealous and have already wired it but am considering doing a major chop of it to get more thickness and lower growth. My question is what time of year (zone 4/5) is best for a major cut back, where on the tree is best to cut and is that even the best idea for what I've got? Any help and advice would be hugely appreciated!