No it isn't. I've had accounts on numerous alternative social networks and none of them are much good as general platforms because there aren't enough other people using them, or using them often enough.

Stop pretending network effects don't exist or that your social media usage habits must be true for everyone else.

replacement != alternative. Not using Facebook is a proper alternative to Facebook. What Facebook provides isn't necessary, and what's bad about Facebook is probably intrinsic to the entire social media model.