u/Maximum-Struggle-974

Hi, I’m from Nova Scotia and made a post about a year ago about my green ash tree that sadly got emerald ash borers, and they killed the main part of the tree (past post in this subreddit: https://www.reddit.com/r/Tree/s/nCBCTJa077).
I was told by you guys that these trees form a bush when they die. I would like to know what my best course of action is. I will give it what it needs to prevent more emerald ash borers. I’ve been watering it like crazy, and in the past month and a half it’s flourished up to 7–8 ft tall.
I want to know if I should kind of train it or give it anything. Any advice would be absolutely amazing.