If you are still growing up, it may be easier to make it longer. Some people stops growing in height when 16, 17, 18. Some people gets longer til they're 20, 21. If your case is still growing, you may fortify the process with Jupiter squares. Look for the proper dates in the 2021 and 2022 calendars.
If you've stopped growing up in height, then it will be more harder to make it longer. Just focus on your advancement and do some workings for self-acceptance or for other things.
Biokinesis is one of the hardest things to do. So I just opine when I say those squares may fortify the process. Anyway, good luck.