If you've reached a plateau in your muscle building journey and aren't sure what changes to make to get your progress started, then I think the P.B.S. Approach can be the solution for you.
Most people can put together a killer workout, but very few can design a proper program. Even fewer know how to adjust a program month-to-month to keep making optimal progress.
This deficiency is especially true for those whose main goal is to gain muscle. While there are some multi-phase templates for strength and strength athletes, there are almost no coherent long-term muscle building plans.