You have a wire scar which even when healed, will likely leave a noticeable horizontal swelling mark circling the trunk. If you decide to keep the tree as is and fatten up the lower trunk as suggested by evmibo, try to develop a branch to hide the wire scar. Alternately, you can use a knife to make a small circular or irregular shape scar on the wire mark, similar to a cut wound formed by removing a small branch, when the scar healed, the callus will break up that horizontal wire mark so that it is not that noticeable.
In spring, during the active growth period, fertilize the tree for one or two weeks, then completely defoliate it, new buds will pop up everywhere for you to develop lower sacrificial branches to fatten up the trunk.