So, it appears as though 'Discourage search engines from indexing this site' was set on my WordPress website and left like it for approx 2 weeks prior to me noticing - only noticed due to sharp decrease in rankings. Feels bad as a lot of work could be undone with just one checkbox being checked and we also had no auditing plugin setup so unable to see who did it.

Has this happened to anybody else in the past? Did it take long to recover from your rankings drop? Thanks!