How can I improve my technique?

You dead sailored it. You could’ve landed it if you weren’t so stiff. It’s easily said but quite hard, you need to be loose and manage to separate bike and rider. You weigh a lot more than the bike, so what you are doing has more impact on the jump than the bike. You were a passenger on this jump and not the rider.

You were leaning way to the right when you landed. I assume you pulled up on the bars to induce that tilt while you were on the ramp. This is the usual reason people land off angle like this.

Use your legs to push down in the bike, and don’t try to pull it up with your arms or your legs.