Do what
@Ironlord just said. And change your mindset, pump doesn't equal growth in general.
Want bigger legs, get a bigger 20 rep squat.
In general though if you want to get a pump in something like legs and you want them to grow faster, legs tend to respond to ultra high reps.
So if you want a stupid pump without doing bfr training, squat your bodyweight on the bar for 50 reps. Rest all you want, so long as the barbell stays on your back. Just get the work in. After do 200 squats with no weight ass to grass in the shortest time you can. Time the workout and repeat weekly and try and improve the time.