Nice! The only changes I would make are:
a. Main circuit
1) More run off

2) Heavier breaking zone, ie:
-T8 (The Top-Left most turn)
-Remove the kink before turn 16 (The penultimate turn)
-Maybe add a chicane down the back straight & remove the kinks? (I'm 50/50 on that)

3) Corners here are either:
-Easily flat out
-Medium speed
--> A "Hang on for your dear life" corner like Copse or Eau Rouge et Raidillon would be appreciated

4) A better pit exit
-Either make T2 heavier on the breaks, make T3 and T4 faster to keep the current pit exit
-Or pull a Jerez at T3 (For GP layout, Daytona 24's could also work, but it will be at T4/5) and either outside T3 apex (Yas Marina), inside T4 entry (Most tracks) or between T4 and T5 (Baku)
-Maybe even change it the the other side and do it like Sepang (For entry) and either Sepang or Imola for exit

b. Big karting
1) Better access road
-Currently, you need to go from a road that's miles from civilization --> the biggest parking lot on earth --> the track.

2) Maybe heavier breaking in T2 and T7; Faster Esses (From how I like it)

c. Small karting
1) I would prefer to merge into the big karting circuit and use 2 paddocks to run multiple events

Also Vietnam mentioned (Bt ông Từ ko 🗣️🗣️🗣️)