Have not been able to save my gardenia plant. Please give me the steps to follow.
Certified GKH Gardening Expert
You did not mention how the plant looks -- whether the leaves have dropped or if you have an infestation of some kind. Here's an article about growing gardenias.
You may find other articles here that specifically address the problems you're having: https://www.gardeningknowhow.com/search?q=gardenia