Its up to you man. Ive gone a more traditional split just to change it up for my body. But it is up to you. I kind of kept the core there and just added to it.
What I mean is, Ill still squat 5x5 for every work out, but chest Ill do 3x 8-10, then do incline, flies, etc. So Ive just added to it, while keeping the basics because I liked them. But then ull get tons of people saying im doing it wrong so at the end of the day it is up to you.
Ive actually got a day off doing anything today so going to the gym to smash out squats, deadlifts and bentovers just for fun.
But man, you have to EAT. Seriously, without a calorie surplus you will not gain muscle and eventually hit plataues. Go eat more whole grains and complex carbs and more protiens.
Also, nothing wrong with a protein supplement at all just for a little something extra. But, MORE FOOD = MORE SIZE.