One of the sites I used to work on has dropped from a consistent #1 (for the past 7 or so years) for its key terms to bottom half of page 1 in the past couple o

One of the sites I used to work on has dropped from a consistent #1 (for the past 7 or so years) for its key terms to bottom half of page 1 in the past couple of days. Traffic is down maybe 20%. I can only assume it's related. The higher results now though are Google News for things totally unrelated and lots of ticket websites (which are kind of related). The site itself is hardly spammy and has several well-written articles posted per week. It's practically the go-to site for this area (local tourist office points people its way for instance). Not my problem any more but coming so soon after I leave, it looks a bit like a FU I left behind!