Beginner Gardening: Do I need to be worried about this hibiscus, 1 by sunray2003

sunray2003 wrote:
Hi,
I recently repotted a hibiscus from a 5 gallon plastic container to 15 gallon. After watering the plant in the 5 gallon, i tried to hit the sides of the pot assuming when I pull the plant out for repotting, it would come with the full root structure. however, when I removed it only part of the root came and the remaining part got stuck to the pot itself. On April 12th when I repotted, it looked like Pic1 and today it looks like Pic2. It seems like the leaves are dying off. What can I do to revive the plant ? I just watered it on 12th and today.

Thanks,
Sunray