Here’s another workout routine for you to try, it’s called the 5/10/20.
For each bodypart, choose 3 or 4 exercises. After doing some warmup sets, preparing for your heaviest working set, do a heavy set for 5 reps. This should be the heaviest weight you can do for 5 reps. Then, after your normal resting time (say a 45-60 seconds or so), decrease the weight and do a set of 10 reps. Finally, rest and do a set of 20 reps. Do this for every exercise in your routine.
What this does is work your muscle fibers in 3 different ways – the first set is a strength set, the second set is the muscle-building set, and the third set is an endurance set.
You can also add one isometric hold after the 3rd set (on each exercise).