Okay, this essay is long, but give it a read if you want to understand why it’s an urban myth to think of English-language haiku merely in terms of 5-7-5 syllables. NaHaiWriMo is not really anti-5-7-5, but it’s hardly the only target for haiku, and in English you don’t need to aim at such a syllable pattern
https://sites.google.com/site/nahaiwrimo/home/why-no-5-7-5