First of all, watch that watering. The soil around the roots should stay moist, but not soggy-wet. The tree is not taking up much water now so its easy to over water. Wait to fertilize it for a couple of months to allow it time to develop feeder roots.
Some pruning may be useful to reduce the leaf canopy which is transpiring water out of the plant. Don't go overboard. Just take out a few branches here and there which are growing too low, rubbing, broken or otherwise need to come out anyway.
If practical you could construct a light shade cover from the hot afternoon sun to cut down on the demands which may be more than the roots can supply at this time. Other than that you'll have to just wait and watch to see how it will do.
Thanks for the question. Please stop in again any time we can help!
Q&A Library Searching Tips