It is rally Hard to see on the photo, but this is what I think.
Follow the trunk from the pot. The heavy bransch to the right is the new leader and the old trunk has at one time been cut above it. Is that right?
In that case those few cm above the new leader/trunk is doing nothing. It needs to be cut flush giving the tree a chance to heal in a natural looking way.
If the cut was done recently by you, you ned to finalize that work. If it was done before you got the tree and has starten to heal I would concider waiting to do it in the future. I would not want stress the tree more at this point. But that is just me, others may think different.