Give us more details, there's so many things you can manipulate to improve but to know what to do we at least need to know what you're doing
Let us know a bit more about your program, weights moved, sets, reps, bodyweight, are you bulking, cutting? etc
I'm currently bulking, weigh around 77kg, aiming to get to about 80-82kg. I do a four day program split between two lower body workouts and two upper body. I generally do lower body on a Monday, upper on Tuesday, play football on a Wednesday, then lower again on Thursday and upper again on Friday.
Sets and reps vary a bit depending on the exercise, but mostly it's four sets of five or six reps. I stick to compound lifts with a bit of isolation work thrown in at the end of each workout. A normal lower body workout will start with squats (back on Monday and then front on Thursday), followed by deadlifts, then RDLs, then split squats or lunges, finishing with leg curls and calf raises using a plate and a bar. My upper body workouts tend to be push/pull, so I'll start with barbell bench press, then do some barbell rows, then incline bench press, then something like weighted pull-ups, then military press and finish with some bicep and tricep work.
I haven't been doing squats for that long. I've always played football, tennis, golf, etc, so I tended to use the excuse that those sports were my leg workouts, but I recently got into squats and now I'm really enjoying them. Due to never having squatted before my squat lags behind my bench and deadlift. Currently I'm at 100kg bench, 140kg deadlift, 110kg squat.