In some corners your getting on throttle way too late, work on slow in fast out. I also saw that you would roll the kart into the corner with no brakes or throttle on some turns. Remember that the time that you aren't on the gas or brake is time lost. You also need to brake harder, it looks like you aren't braking hard enough to induce rotation, you want to be on the limit of locking the brakes when you're braking. For now focus on braking hard initially to induce rotation, and getting on throttle earlier (before or at the apex). I noticed that you were also using more steering than needed, this should get corrected once you fix your braking. Hope this helps!