You can stay on top of your casework by breaking up the process into multiple tasks, and reviewing cases frequently. You'll be much more productive by focusing on completing small, achievable goals.
Next time you add a case, add a case update and describe the task that needs completing. Set the due date for a week's time, or whenever the task can be reasonably completed. You'll be prompted to review the case on the due date and can update the case. You can also set a default due date and time for your casework.
Remember: a case often has several factors that determine when and how it can be solved. You don't need to solve each case immediately, but by completing each step in a timely manner, you're more likely to stay on top of your casework.