I need some help on doing consecutive htw my record is 6 and i have been freestyling for 6 months ( im 12 years old
If you can already do 6, then you don't need any advice beyond "keep practicing."
Being unable to continue after 6 probably has nothing to do with your technique because 6 of anything in a row, consistently, means you know HOW to do it.
What you likely need is greater stamina AND FOCUS. You begin to tire and lose focus and drop the ball.
Good luck, bro.