The smaller and more chopped up your compost components are, the faster they will decompose. Turning the pile more often will speed up the decomposition process. If you don't want to turn the pile more often, try poking holes into it to allow more oxygen into the center of the pile. It is good that you have your compost pile in direct contact with the ground, so that earthworms can help you with the decomposition process. To have a compost pile that heats up and decomposes quickly, it is generally recommended that the pile be 3 ft high, wide and deep .
Smaller ones work though.
Mine aren't usually large. They just take a little longer. Be sure the compost pile is getting enough moisture , but not too much. It should be thoroughly damp, not dripping wet. Protect your compost pile from rain by covering it with plastic.