Google Search Console is a mainstream utility suite that many webmasters for business start-ups use as an unpaid alternative to premium services offered elsewhere on the web. While paid equivalents like SEMrush and Ahrefs leave the webmaster better-equipped to sift through the very complex and nuanced "rules" of top-quality SEO, Google's free tools provide a good starting point and help owners get acclimated to SEO mentality. One of the various functions of the Search Console that introduce this mentality is the "Average Position" rating, which vaguely estimates the rate of success that the user's current content and SEO plans should be meeting with.
This rating is designed to work with websites that have already been present on Google's SERPs for some time, so any changes to a site's substance will affect the rating at the same time as the site's SERP positions. If a website's content pages get changed, the site is likely to lose the ranking credit it had previously amassed for Google queries for certain keywords, and Google will begin considering the website to be accruing ranking credit for new keywords from scratch. The Search Console will therefore be likely to report a very significant drop in the Average Position rating that will take some time to slowly build back up. The rating can also drop very slightly and very briefly whenever the website introduces new content pages while leaving the established pages untouched.
What the Search Console presents as the website's "Average Position" is not clearly defined and is often criticized for potentially taking far too many data points into account for it to meaningfully indicate specific areas where the website's SEO could stand to be improved. At best, it can only indicate in a very vague sense whether the new or changed content will leave the website's rankings slightly worse off in the long term. The user would generally have to wait three weeks after each large change or addition in order to determine whether the accompanying reduction to the Average Position rating successfully rebounds and potentially converts itself into a long-term increase. For more information click here https://www.reddit.com/r/SEO/comments/cy7hsk/averagepositiondropinsearchconsolehow_to/.