You will not be able to harvest everything and have it continue to lived. But like Rosebud said, you can put it back into veg light and give veg nutes and hope for a reveg. I personally have found that I need to leave far more than 5 buds sites for my plants to reveg. They do best when I leave about 1/4 or so of the plant. Revegging does not always work and it can take some time. I generally only recommend trying it if you have a great phenol you want to try and save.