Your not the only one to be on as long and wont be the last. Pro's retire, priorities change and life takes different courses. How old you are will make a difference. The right course of ancillaries and just time is all you can do. That and keeping a steady training program which does not over tax your body will
improve results. A dramatic change in workouts is going to be in the picture.
If not, you'll only set back what your trying to restore.
"THEY" can come back, but it will take time, a long time. Like year+.