Adjust tire pressure to trail surface, particularly for the rear tire since you don't have rear suspension. Smooth trail, high pressure. Rocky rough trail, low pressure. This can make a surprising difference in handling and control.

On downhills, stretch out and back. The steeper, the farther back off the seat your butt should be.

Get comfortable with speed in technical sections. It will carry you through much more smoothly and effortlessly than slow pedaling.

Get a camelback, drink tons of water.