what are your exercises for each day?! Seems like you have a good base down, but maybe try incorporating a lower/upper body mix to the 3 days of training, or maybe a push/pull split as well. 16 sets for shoulders, 4 traps, and 12 more sets for legs, seems like quite the load for one workout.
Definitely check out some routines online. There's plenty of options for you that you can stick with your 3 day split, just modified.