To add to Leatherback's point, the more vigorously tge tree has been growing, the better the back-budding response you'll get. Plus, letting the tree grow freely will thicken the trunk quickly.
I got a matchstick-thick cutting to grow to an inch and a half (4 cm) in caliper in two years by setting the pot outside on the ground in the summer and letting the roots grow into the ground. When I chopped it back to a stump, it threw out new buds everywhere.