No, no specific question. Sorry, I don't understand the last sentence
, English is not my first language.
A 'shift up in challenge' would be increasing the amount of weight lifted, the number of sets completed, or the number of repetitions per set increased, for example. Also, it is important to change your routine on a regular basis to keep the body guessing and challenged. This can be done by doing different exercises, doing similar exercises at a different speed or tempo, or both.