The Angels are reminding you that something remains unfinished in your life. This is likely a project that you have started in the past and then abandoned. It is important for you to complete the work.
Someone will benefit from this work, and your completion of it heralds the beginning of a new phase of spiritual accomplishment.
The Angels could be calling you into a life of service in some area, but finishing the task you have left undone is necessary to demonstrate that you can be reliable and diligent in your work.