squat lgi kak and pakai belt for back support

If you are targeting your hamstring the form is good

You are right on track. Just keep a neutral spine, glide the bar along your shin, slightly bend your knees and push your hip back as you go down. You will feel a stretch on your gluteal and hamstring muscles as you go down. Squeeze your glutes as you stand upright. DO NOT HYPEREXTEND YOUR BACK!! PS: Use olympic size plates, bigger in circumference, less range of motion.