Keeping a high workload just to catch up is a bad idea. It will only make matters worse as you risk doing poorly with a high workload. Just figure that you will be taking more time to graduate and you’ll have a better chance of actually graduating.
You may not have a choice after this semester as you will probably be asked to take some time off. Harvard will want that time off to be productive. They will require proof that it was productive. (a friend of my son was asked by Harvard to take some time off due to a low GPA and that was what was required of him)