If you are in the gym, you can do it with a barbell. If you are at home, you can also make it with rice bags.
Squat up several times with a 50 kg rice bag until you are slightly tired, rest for 5 minutes, do it again and repeat it for 3 times.
The effect is obvious after one month. But at first, you must do less. If you don't do it, your knee may suddenly hurt. Step by step.
Come on! I wish you become a strong person!