If you accept that there is a natty limit on muscle growth (there is).
And you accept that different exercises target different muscle groups and regions.
Then all you need is to hypertrophy a little every week on exercises that hit everything you want to grow. If you have good exercise selection (stable, can be loaded, targets the muscle well), with time you'll hit your limit.
In this mental model, more volume and frequency would just bring you faster to the goal (which isn't a bad thing considering progress motivates most trainees).
All this need to be well dosed to limit overuse injuries, overlap between exercises but also to make sure you're having net hypertrophy every week (aka the minimal training dose).
You can legit get away (as a trained lifter) with 1 set 2x a week and grow (albeit slowly), so that's a good starting place.