As Stangmx pointed out, this crash started when you turned in too early for the previous corner which gave you poor track position entering the right hander.
You can see in the video that there are lots of cones in the corners, those cones are there to give you specific information about where you bike should be positioned on the track, and this is the key part: The cones also tell you what direction the bike should be pointed at that specific moment.
If you stop the video at 4:13 you can see two apex cones on the left side of the track. If you have your bike close to the cones with your knee over the curb you will apex the corner in the right place. If you also have your bike parallel to the two cones, then your bike will be pointed in the right direction while at that apex. (Parallel means that your front tire and back tire are the same distance from the two cones when you are beside them)
This proper bike placement would have resulted in the bike pointed the right direction for a safer entry into the right hander.
It sounds like you had hard parts hit the ground before you lost grip, but even with more ground clearance your current bike placement will still result in that same crash in that same corner, maybe not at your current speed, but as soon as you tried to go even a tiny bit faster, that bike placement will exceed the limits of the tire.
At 2:13 the rider in front of you does exactly the same thing. You can clearly see that he apexes the corner way before the two cones and he is nowhere near parallel to the cones as he goes by them. (Front wheel is further away from front cone that back wheel from back cone). This results in lots of risk and being way wide of the cones at 2:17 and again at 2:20. At 2:20 you can see that he is adding lean after the cones while trying to accelerate onto the straight, which has all the ingredients for a highside.