Focus on the lower lines and try to make space in order to have more match options. The idea strategy is to combine a wrapped candy with a stripped one in the lower lines. Are you stuck on Candy Crush Level 21? You should watch our video:

Clear all the jelly and reach 27000 to complete this level.

1 star: 27000 points
2 stars: 50000 points
3 stars: 90000 points

Patricia Frederick’s Tips for Candy Crush Level 21

Striped candy matches clear a lot of jellies, but a striped/wrapped combo is even better. If you can make a color bomb/striped candy combo, you should clear loads of jellies.