Follow your strength is a nice and polite way of saying don’t under lift but don’t over lift. I recently listened to two guys brag about their weight lifting . One said I may be able to lift that in a few days. They had stated their lifting weight one with bulging arms ( time to buy new new shirts. The other you could see developing muscles but not yet bulging. My eyes really popped. One thing I was listening and not part of the conversation but if you are lifting 45 pounds less than someone don’t think in afewdays you will be able to the same. It is wise to follow your trainer or listen to your body it speaks to you. Really.
First of all you don’t know how long it took an individual to get to their lifting weight, what is the routine. I know this because I workout with several trainer (beachbodyondemand) and it depends on the series of routine, the position, the pace and other factors which decides the weights to use. Do my lifting increase, slowly yes. Most of all good form and safety is important.
Speaking from experience and growth I say follow your strength, your body will tell you when its time to increase because the weights will seem lighter or you will do far more reps than you thought. Challenge yourself but again with safety and not too rapidly, which can cause injury. Also it’s okay to challenge yourself with an increase in weights for a few reps then decrease.
Consistency is key, you will get there. To weeks of challenges on weight lifting with great results.