On-Site SEO (Clicks, Impressions, CTR, Position)

Hi,

In order to improve our onsite-SEO, we need to update/improve our posts based on Google Search Console data downloaded in Clicks, Impressions, CTR, and Position format. What should be the preference for updating the posts? Preference as in, should we start updating with low ranking posts first or low CTR posts first, from the GSC data?

Thanks in advance for your advice.