Pump any lumps in the corner to maintain even traction through the corner
Pump through shorter corners. Push down on the pedals (lift your body) as you brake just before the corner. As you start to turn allow your weight to drop down again so that your weight is coming down on the outside pedal once the bike is leant over, your bodies downward momentum it adds extra downward force to the pedal and tyres hence more grip. Push your weight back up as you exit the turn to get the same effect.
Weight up the front end a little more on loose turns then lean back slightly as you pedal out to get better rear wheel traction.
Go light as you change turning direction making it easier to swap the lean of the bike over whilst adding pressure to the next turn.
Use any proud roots or ruts running parallel to your line for a little extra grip.