The peak of Facebook's usefulness was, for me, some time around when I joined in 2005. I don't think there has, in that entire span, been a change where I thought "wow this is great!". Everything I've noticed has either been neutral or negative.

The best thing I did recently was turn on 2-factor auth for Facebook. Now, because it's mildly annoying to log in, I haven't logged in in weeks. I still can, but I don't.

Facebook changed from an extremely high engagement niche product to a nearly free-of-utility product with the goal of capturing the entire planet as users.