Landing page and seo !!!!!

Hello Guys,
i have 4 keywords and all are high competition every 2 keywords have the same main but ppl using them both.
analyzing this keyword in diffrant SE and has diffrant resluts so i will spilt this keywords in to landing pages with sub domains and here my qesations :
1- is this good stragerty
2- do word count is important to rank a keyword. i mean landing page is just 1 page and word count will not be like other big websites.

do you have exprince with landing page and seo resluts and what do u think

Please take some time to make your post like created for people. As for your question - yes word count helps in terms of getting rankings. I don't know if there's a point of creating a subdomain for each keyword, as you'd be more beneficial, if all of your SEO efforts would bring benefits to your whole domain.