An SEO professional was concerned about a significant decrease in traffic. They did an audit and performed large-scale site changes.
They also discovered during the audit that there were likely some quality issues.
They were able to address those issues by February. By the June core update, they saw some increases, but they were not to the level that they saw before the decrease about a year ago.
So their question was: if the site quality issues were the cause, is this the level of recovery that they could expect?
John Mueller said they don’t have to fix anything. Instead, if they improve the relevance of the site, then they have a different website.
Large-scale site changes completed at once will trigger a new Google evaluation of your site. You don’t have to wait until the next core update for a recovery if the changes are large enough in scope.
John also explained that with core updates, it’s more of a relevance issue of the site overall than single things you have to fix.
This discussion happens at approximately the 18:32 mark in the video.