With your first move check whether you can clear at least one of the Icing on the top row either by matching candies adjacent to it or by making a special candy that will clear the Icing.
Next focus on detonating the Jelly Cake as quickly as you can because doing this will clear all the Icing on the top row, allowing more candies on the playing field and it will increase the open space in which you can make special candies, making it easier to make them.
Match candies near the bottom of the playing field as often as you can. Doing this will shift the largest amount of candies, hopefully start a chain reaction and create new opportunities to make special candies. With candies of five colors on the playing field you shouldn’t have too many problems making special candies. Try to make as many special candies as you can and when possible combine them to maximize their effects.
While matching candies at the bottom it can be easy to ignore making special candies at the top of the playing field. So pause after every move and glance at the entire playing field to see whether you can make special candies.