I bought a twisted trunk hibiscus tree about a month ago. It then turned cold for a few days, so i kept the plant inside for about a week. When i put it outside i repotted it and it rained alot, thus the tree stood in water for a few days before i noticed the pot wasnt draining. I drilled more holes in the bottom and it is draining fine. The tree has since basically died!! All the leaves are brown and wilted up. I need some ideas on trying to revive this plant please.

Thanks- Hibiscus beginner!!