My reach is still rather large, but my post frequency is low and my engagement is super high. Post engagement is the ONLY factor when it comes to reach. If you watch your reach on a per post basis you will notice that the more engagement a post gets the more your reach extends. As far as links go, clicks hold the most weight when it comes to factoring in reach for a post. We have seen SUPER clickbait get insane reach and great articles get the worst reach possible simply because the engagement on what we thought was a great article wasn't high enough.