Most people can put together a killer workout, but very few can design a proper program. Even fewer know how to adjust a program from month to month to keep making optimal progress.
This deficiency is particularly true for those whose primary goal is muscle gain. While there are quite a few multi-phase templates available for strength and power athletes, there are almost zero coherent long-term muscle-building plans available.
Read Primer, Build, Solidify (PBS): A System That Unlocks Long-Term Muscle Growth at its original source Breaking Muscle: