I've been trying to do the same. Most of the communication has moved to WhatsApp and the "here's what's going on in my life" blasts have moved to Twitter and Instagram. It seems like people have reverted back to using plain old email (or Evite) for event invitations (thank God for the former ehhh on the latter).

The big impediment left has been Facebook's function as a social space to share photos with all and sundry. If not for it being the place to post photos of kids, weddings, vacations, etc. I don't think people would be spending much time on it. Seeing pictures of their nephews, nieces, kids, and grandkids on there is definitely what keeps the old people plugged in.

There really isn't another service that fills the niche either. Instagram is geared towards individual photos rather than albums or chronicles of events. Flickr kind of did, but it's basically dead now and its narrow focus on photography alone wound up gearing it towards pro or hobbyist photographers and didn't get much buy in from everyday users.

Facebook also seems to be something of a default space to host a bulletin board or community forum. Next-door has been trying to muscle in on that territory but it's been plagued by problems with racist usage patterns. Those would probably go away if it was more common, but it's created some real issues with optics. Also, I have no idea what their security practices are like so who knows if it's an improvement.

Google Photos isn't bad for making and sharing albums. But then again you're just trading one giant for another.