The squat serves as the foundation for all lower-body exercises. So if you want the best results, you need to spend time in a squat position daily. This doesn’t mean you need to squat heavy or even underload every day.
But it does mean you need to 1) accumulate as many reps as possible of the squat, and 2) spend as much time as possible in a deep squat position.
To start, I recommend squatting under load three times per week. As for the other days, you should do bodyweight squats and squat mobility work like spending 5-to-10 minutes in a deep squat.
It doesn’t have to be more complicated than that. I like to rotate between barbell front squats, barbell back squats, box squats, and goblet squats.
Be sure to mix the load and rep scheme within the same week or every couple weeks to prevent plateaus. Do heavy strength work in the 3-to-5 rep range, hypertrophy work in the 6-to-12 rep range, and endurance work in the 15-to-20-plus rep range.
Related: Squats For A Powerful Lower Body