Do what you can and don't worry about the rest. Remember the world was not created in a day, so why do we feel like failures if a task is not completed, at the end of a day.
Have you ever considered, the task was not completed because God has a different plan. Maybe God want you to learn and grow through the process. Don't be in a rush. Keep praying and waiting, you will complete the task in God's perfect timing.
Prayer gives you power to walk on purpose