First: The Position of your Stick/Pole is bad because you hammered it through the roots of the tree.
Second: Don´t hammer it in the ground complete vertical. It has so not alot of power against the wind.
If you wanna do it by yourself lock at the paintament.
2 options: 1 Stick slanting and tie it very high. just short under the first side branch.
Or 3 Sticks nearly vertical and also tie it just short under the first side branch.
To tie take a coconut cord if available.
Oh and this tree will most likely die anyway because the canals for water and other things in the tree are most likely damaged when it is bend over like this.