"i have done good amount of watering as required and added some fertilizer as well while i transplanted it."
Plumerias like to be on the dry side here so make sure you do not water a "too much" quantity that might trigger rotting. A very well draining potting mix like cactus potting mix would be good.
When you fertilize plumerias, look for low nitrogen, high phosphorus fertilizers. An example would be a fertilizer with a NPK Ratio of 10-30-10 or 10-50-10. Blooming creates branches afterwards, which is good; and too much nitrogen just makes them zoom higher and higher sans flowers or branches.
