Breakdown Your Plateau In 4 Steps
Periodise Your Training
If you have no structure to your training then you will hit a plateau very quickly and struggle to beat it because what you're doing is making it easy on your muscle. There needs to be a methodical plan behind your training which scientifically forces hypertrophy to happen, which requires periodization.
You move between lower volume workouts which are all about intensity, to moderate volume and then high volume etc. These are the same principles used around Y3T, which means that you're constantly manipulating your CNS and allowing yourself to continuously grow as a result. If you're doing the same volume, same reps and same level of intensity each week nothing will change.
Measure Your Food
If you're not measuring your food then you're guessing, which means you have no frigging clue what your diet really is doing. This is such a common reason for plateaus to occur simply because you are out on the required calories, which means that you're unable to get the response you want. If you're under eating and want to build muscle, that WON'T happen so start tracking TODAY to see where you really are.
Train With Variety
I'm not here to push Y3T to on you, I'm here to help you understand how to get better results overall. However, Y3T does utilize a very varied rep range across the 3 week training cycle which means that you're targeting ALL 3 muscle fibre types within the body rather than just 1 for instance. One of the reasons a muscle won't grow anymore is because of a lack of stimulation in the right areas. If you're predominately made up of slow twitch fibers within a muscle group (say 70% for example) and you never train them, that's 70% potential LOST every time you fail to target them.
Are you following the changes you're physique is going through and comparing that to the things you've changed about your diet, workouts and lifestyle? You need to monitor specific metrics otherwise again you're just guessing.
Ultimately, this is about being smarter with your training, being more specific and taking the time to analyze things. There's no reason a plateau should set in if you're doing these things.