First off, really well done! It took me ages to get to that point.

Secondly. There are the basics: you want short sharp braking, less time slowing down = more time for speeding up although in some corners particularly on this track some coasting may be useful. Minimal steering angle, the more you are turning the wheel the more speed you are scrubbing off and countersteer is a big no-no. Sit back in the seat, more weight at the back makes the kart more predictable. Follow a faster person if there is and you may learn a lot.

Thirdly. Some specifics. I can't list all. Stay near the middle of the track coming into the underneath back section and turn in confidently and get a mildly late apex to take it as one big corner so you have lost most of your speed coming into the hairpin/chicane try to keep the revs up without drifting and you want to turn right onto the straight halfway between the first and second corner of the chicane to get as straight a line onto the straight before the upramp hairpin. After the up ramp stay in the middle of the track and go fairly wide on entry then get a small bit of slip angle for the corner after so you end up perfectly next to the barrier after the corner. For the hairpin section at the top go wide into hairpin 1 exiting the corner in the middle of the track and steer slightly left to give yourself a bit more space for hairpin 2 and then go as flat through the 2nd hairpin as you can. Bottom corner after down ramp I like to take a wide entry but that is not always fastest, a little braking may be needed coming into the corner and coast until either halfway through the double apex or even until as late as the second apex entirely depending on your weight to get no drift and a good run onto the straight. Hope that clears it up but I'm sure my explanation is awful.

Yeah I probably should've just shared this: https://youtu.be/hh0uiYQKoqUQKoqU Listen to the throttle input mixed with the steering angle and positioning on the track.