>>76619512
Add reps and/or weights.
Like, when you add weight to the lift, the rep number will drop, so then you'll be progressing by adding more reps to the lift until you get to 12 or however many reps you typically do.
Then you add weight again, your max reps will drop again, and then you'll start working towards your max reps again.
On my squats I progress by adding 5-10kg, but my reps drop from 12 to 6-7, then I progress until I get to 12 reps again on this new weight, then I add 5-10kg again. I currently squat 140kg for 8 reps.