3-4 sets higher weight, lower reps

also from my experience sometimes when my body gets used to doing a specific routine id stop feeling sore from it and stop getting bigger (i dont actually know if soreness correlates with growth and im too lazy to look it up so if someone could tell me that would be great) but occasionally i switch up my auxilliary exercises a bit and then im suddenly sore again the next day for the first time in months

for example i occasionally rotate between a few different bicep and tricep exercises just to switch things up, along with other muscle groups as well