You can only build muscle at a certain rate. I decided to try and track how much muscle I gained in a year using full body workouts, 4 days per week. See the results here.
How Fast Can You Build Muscle Naturally?
Do you think I can main gain 10lbs + of muscle in 1 year? : r/GregDoucette
How Fast Can I Build Muscle Naturally? A Step-By-Step Guide
What is the maximum muscle gain for my 2nd year in muscle building? - Quora
How Fast Can I Build Muscle Naturally? A Step-By-Step Guide
How Much Muscle Can You Gain Naturally? - BuiltLean
Building muscle requires you to train with intensity, lift
9 Killer Ways To Gain Muscle Naturally!
How Much Muscle Can You Gain in a Month?
Mass gain: how much muscle can you realistically expect?
How Much Muscle Will You Really Gain as a Natural Each Year!!!