At the start of the level don’t worry about the bottom half of the playing field just yet. With 40 moves to complete the level you’ve got plenty of moves to deal with the bottom half later.
What you should focus on first is clearing the blockers at the upper half of the playing field first. With the blockers gone it will become much easier to make special candies which you then can use to clear the blockers and Jellies at the bottom half.
Match candies near the bottom of the playing field (or as low as possible) as often as you can. Doing this will shift the largest amount of candies and hopefully start a chain reaction that will hit / clear a few blockers and create new opportunities to make special candies.
Most of the Jellies are easily cleared, but the ones highlighted in red (image below) can be difficult to clear because they’re secluded. Keep this in mind and make special candies accordingly.