Good results come from good performances, and good performances come from being focused and in the moment. When you are in the moment you do everything you have practised. There are many ways you can work on this: building up your fitness, improving your orienteering techniques, refining your mental routines to cope well in pressure situations, and so on. Let's just take an example of something you may have given little thought to: your race day routine.
If you want to improve your chance of a good result, it's not just how you will find the controls out on the course, it also involves how you will prepare for the race and feel that you are ready to start well. Developing this as a routine makes it happen more easily.
You can practice these routines by recreating the race conditions (start times, call-ups, etc.) in training exercises, or by using orienteering competitions that are less important to you. This way when a more important race comes along you will be doing all the things that you have practiced and you are good at.
A note from On The Red Line editorial:
Following on from Alasdair's article, you could:
As a side benefit, it includes close-ups of many of the best-known names in international orienteering, names you will no doubt see in On The Red Line as the competition season unfolds.