Question about Keyword Research method ?

Hello guys,

One of the ways that I test new keywords that I can potentially rank for is by publishing test articles of "1000 words" (well written), and if they rank near page 1, then I update it by writing a much longer/better content version of it.

So, realizing that adding quite a few 1000 words articles "each week", can be considered as thin content.

So, my question is, can this method hurt my SEO? If Google notices that I publish a lot of short articles each week?

I'd love to hear your valuable feedbacks guys.

Thank you