Hi Akhater, this is very good. Now we know that you had buried the tree too deeply before. That could have killed the tree right there. Make the mound ring a bit taller. Now cover the root ball area with a layer of mulch to protect those small roots. Then fertilise it lightly because these trees are light feeders. They like it on the dry side, so don't keep it soaking wet all the time. In the ground, you could probably water it every 2-3 days in the summer and 6-7 days in the winter.
That's some nasry red clay you have there. Is it well draining?
One more thing, you can stop calling me sensei. It's not funny anymore.