So, I'm following this guy in instagram and I have been going to his website and i follow everything what he says and it has worked for me either doing squats, lower back, and upper exercises. His name is Michael Morelli and he is amazing! you can follow him and watch his videos which i do implement to my daily workout routine.
https://morellifit.com/category/fatlossfiguredout/
One thing that I learned tho, to increase muscle gain is that when you lift up weights you have to do it slow and in control. Dude! you won't believe how hard it is to lift a 35lb dumbbell when you do it slow (usually between 20-30seconds). I usually was doing it fast but when I discovered this new technique i have seen results. Good luck!