My first question relates to this Cestrum Nocturnum near my fence. It has been allowed to grow to something like 2.5m tall, like in this photo:

After doing some research, I decide to cut it down to 1m, and now it looks like this:

My question is: since I have allowed it to grow to a big tree with a trunk of 16cm in diameter, and with the diametre of the thick branch at 6.5cm, I guess it cannot be turned back into a shrub now, can it? and with its position so close to the fence, I suppose my best option is to remove it totally.
Any suggestions?