Powerlifters typically focus on the lower rep range. While the 3x5 rep range is basic, you could try such as 3x3 for strength gains. Do them heavier than those 3x5. Alternating between 3x5 and 3x3 on different training days.
Just gradually increase the weight by 2.5 kg/5lbs.
I myself currently focusing on Olympic lifting, I do singles, my goal is to prioritize quality and technique over volume.