How can i make my manual last longer

Put your but lower. Really sit in there. Also for me it helped to push my knees outwards and have a wider stance to balance

Pretty much universally: Need to get your ass lower to actually lock into it. Learn how to safely jump off the back of your bike and run out a loop-out so you can really commit. 

Your arms are locked out (which is good) but you want them a bit closer to in front of your face, which comes with lowering the rest of your body closer to that back tire

Try to not lean to the right or left when you’re first locking in ( at least when you’re learning) and focus more on staying centered so the bike moves in a straight line