When a user hasn't been active on a site for a while, it's usually because they've lost interest in the site or no longer have a use for it. In this case, the user's last post was in May of 2017, so it's likely that they haven't been active since then. If you're looking to reach out to this user, you can try sending them a private message or emailing them directly. However, there's no guarantee that they'll respond, as they may no longer be interested in the site.