Ok, thank you.
Are you recommending that I should put the tree outside now, in the US winter. Protecting from frost but letting it get cold.?
Trees need an environment as much like where they evolved as possible, allowing for being in pots rather than in the ground. If you are in a moderate place in the US like Alabama, where I am and the temperadrop below freezing three or four times a year, yes outside right now with no extra work. If you are in Wisconsin, you need to do some work. If your tree evolved in a place with little freezing weather, even more work.
Ask Google about bonsai clubs near you. Find out what they do for trees of your breed, and follow their advice.