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How to win competitions is a 1-hour topic of discussion which I used to do in the past. Hope I can share that someday as a webinar soon. Honestly very difficult to explain in a message here.
Key thing is to focus on the competition guidelines and most importantly the theme. You can also check previous years winning images to get inspired.
And again, you need to have those wow images for which you need to have a strong foundation of photography along with composition skills. Go through the courses here and you will get there.