This is the most important piece of lifting wisdom I can give you: Plateaus aren't real. If you keep training with enough volume and intensity, you will keep progressing indefinitely, on the exact same routine. Think about it; there is no biological explanation of why a body that is continually subjected to a stress that is near the limit of its ability would suddenly stop adapting to it merely because the stressor is not varied enough. "But everything stops working after a while, and you hit a wall!" Nope. People just expect faster progression than is naturally possible. Adding a tiny bit of weight on the bar every couple of months is an excellent rate of progress that will take you very far if you keep at it for years and resist shiny object syndrome. "Switching things up" is almost always the wrong move. It just makes you waste time as your body adapts to the new approach, and that is time you could've spent pushing your limits; the limits your old routine was already pushing, which is exactly why you were progressing slowly on it. Your new routine, on the other hand, makes you "progress" fast because what you're seeing is not real progress, but merely acclimation. You need to ask yourself what the point is: maintaining the illusion of progress to keep yourself happy, or actually building strength and muscle.