How to Fix/Treat Your Late Projects?
1. Identify the cause(s) of the delay(s)
2. Identify and agree on actions to mitigate the delay(s)
3. Assign responsibilities and deadlines for completing these actions
4. Keep checking on the status of these actions to ensure they are completed
These steps need to involve the Project Team, in particular those directly responsible for delivering the work, with buy-in and direction from the Project Manager / Director.
If you are a Planner then you have a key role in facilitating the above steps and you also need to ensure the program is adjusted to reflect any changes that come as a result of following them.