Shortening the stirrup leathers will do the trick. Even one or tow holes more than usual help you getting in a better position. When you tried this for a few jumps you should have a better feeling for the motion process and can return to your usual stirrup length for jumping.
2 point is more about getting your butt out of the saddle. The only time you need to really lean forward is when you are doing bigger jumps like 3 ft and above. That's when you really see the riders start leaning forward against the horse's neck. It's less about you 'folding' and more about your horse coming up towards you and you lean forward to keep balance. That's why it's super hard to do jumping position when the horse isn't actually jumping. And if the issue is that you can not keep your 2 point or it's not high enough, then check your leg position because it may be too far forwards or backwards.
Practise doing your 2point when you are not jumping But trotting or cantering around. You Can get someone to film you and then you Can slowly improve yourself. Once you Got it in the canter you Can start over the jumps