Keep an eye out for any possible formations. If you get a colour bomb use it to help you limit the colours on the board for a bit and therefore make it easier to create combinations.
For old mobile versions, keep restarting the level until you see a move that will make a wrapped candy. From there you should be able to drop in a striped candy pretty easily. Always look to make a wrapped candy before you make a move. You can usually make a striped candy out of a wrapped candy formation if you need it. Also, do not hesitate to break open those mystery candies if you are out of options!
Here is a priority list if there are multiple items on the board listed from highest to lowest: