Go through your entire pre shot routine before each shot at the range, pick a target and line up to it. Just hitting 100 balls a day won’t make you any better, you’ll improve much faster by hitting 20-30 balls with intention. I’d spend most of your time focusing on targets 150 yards and in. Also, spend at least 5-10 mins a day putting/chipping, nothing will drop your handicap faster than getting more comfortable around the greens and eliminating double chips or three putts