You don't have to be "The Boxer" to identify with "The Struggle". So, right now put yourself in the shoes of the boxer. You are THE BOXER...only IF the fighter still remains.
As a great boxer (not just good or ok) you've dedicated your life to training. An appeal of boxing is that it's such a vivid demonstration of you vs him. It's a one on one test where all of your training comes to the forefront and your skill as a fighter is demonstrated in front of thousands. Again, the competition is the test or testament toward your training and skill as a fighter.
The raw brutal nature of the sport does not permit you to slack in your training. If your not on point every weakness, every flaw, and every oversight in your training will be exploited. To put it bluntly "you will get your ass kicked". You don't want to get your ass kicked! So, what are you gonna do?
Start with the truth. Does the fighter still remain? Are you committed? Know yourself. Be truthful. Be authentic. Know what your good at and what your not. Know where your training is falling short and conversely what works.
Know that the other guy (your competitor) is a lot like you. He struggles just like you and has fears just like you. He dreams just like you. Does he train just like you?
Know that like life your training is a series of decisions. Every day you make choices that effect the quality of your training. Are you early out of bed eager to get going? Do you eat breakfast? Throughout the day are your nutrition selections appropriate? Do you have a honest to goodness training plan? Do you surround yourself with goal oriented individuals?
Analyze your training. Is it balanced? Do you overemphasize strength and conditioning over actual skill development or vice versa? What can be improved? What exercises can you get rid of? What exercises should you add?
What injuries do you need to address? What kind of injuries are prevalent in your sport, career or activity that you need to prevent? Be proactive and that comes from being truthful.
End with the truth. Does the fighter still remain?