Three options here:
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Take any decent looking hot sauce recipe you found online, replace the peppers with a hotter one if they're not already cayennes or habaneros or hotter, remove all the low impact ingredients (chilli powder, parsely, that sort of thing), and add like a bay leaf or something. Claim the bay leaf is the secret (it's not, but you need to have a secret). This will beat everyone else who used a recipe they just pulled off the internet (because you removed the low impact ingredients and claimed the secret was the bay leaf).
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Get the hottest pepper you can find and mix it with sugar, garlic, and salt. But mostly the peppers. This is a cynical option aimed at people who will vote for the hottest sauce to prove their toughness or something. However, this is very unlikely to win, because hot sauce contests tend to have way too many people who think this is how you win, and that's a crowded field.
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Pick a strongly flavored ingredient like a tropical fruit, mint, or pickled onions. Pick a similar ingredient to accent it, like a second tropical fruit, an herb, or pickled garlic (respectively). Make a sauce that's like 2 parts the first, 1 part the second, add the right amount of salt (taste it) and add roast hot peppers (probably cayenne or habanero again) until it has a strong kick. Ideally you should do a second batch where it's all cooked together once you know the best ratio.
That last one is nice because, after you've tried a few iterations, you have your own hot sauce recipe! No shenanigans at all. It's also very likely to win if everyone else goes for the hottest sauce possible.