To increase your squat lift use the following protocol.
Go heavy on your lifts and aim for 2 rest days between lift days.
Combine these lift sets with lower intensity workouts during the week.
Day 1 + 3
Back Squat 6 reps 2 sets
Front Squat 1 rep 6 sets
Glute Ham Raise (weighted) 6 reps 8 sets
Day 2
Back Squat 6 reps 3 sets
Pull Up 6 reps 2 sets
Glute Ham Raise 20 reps 1 set
Day 1 + 3
Back Squat 6 reps 4 sets
Pull Up 5 reps 2 sets, 1 rep 3 sets
Back Extension 20 reps 1 set
Day 2
Back Squat 6 reps 2 sets
Front Squat 2 reps 6 sets
Glute Ham Raise (weighted) 6 reps 8 sets
Day 1 + 3
Back Squat 6 reps 2 sets
Front Squat 3 reps 6 sets
Glute Ham Raise (weighted) 6 reps 8 sets
Day 2
Back Squat 6 reps 6 sets
Pull Ups 4 reps 2 sets, 2 reps 3 sets
Glute Ham Raise 20 reps 1 set