If it ain't broken, don't fix it.
There is far too many fitness misconceptions on the topic of "muscle confusion" in the industry. Let me make this point clear. It is impossible to "confuse your muscles" or "keep the body guessing." This has caused so many problems for people trying to make progress that it makes me sad.
The body loves pattern. It thrives off of it. Consistency, and overload with the same patterns/movements/exercises is how you develop a physique. This is crucial to understand. There is no need to constantly change your workout split/routine as long as it is properly structured. Your job in the gym is to make PROGRESS through either added weight over time, or added repetitions/shorter rest periods at a specific targeted weight. The key is to realize that the movement stays the same.
Let me give you an example. With my own personal split/routine, I have not changed ONE THING ABOUT IT in 3 years. It is exactly the same, the only thing different is that I am much stronger at all of THE SAME movements over time.
If we break it down with a specific exercise example, we will use the deadlift. My scheme on deadlifts is typically 5 sets of 5 reps at a certain target weight. Year one, my 5 sets of 5 reps was done at 225 LBS. With year two, my 5 sets of 5 reps was at 315 LBS. With year three, my 5 sets of 5 reps was at 405 LBS. Each week for over 150 weeks straight, nothing changed for my workout structure. I forced my body to become stronger and adapt better at all of those same exercises.
This is how you NEED to structure all of your exercises to make long term progression. Once an individual stops changing their exercises and focuses on getting stronger/more efficient at their current lifts, the faster they will make progress guaranteed. The body loves three things. Patterns, progression, and consistency. Lean to do things the correct way.