If everybody's only there once every week or two you're looking at something like 10-20% attendance on any given day. Some teams or individuals might coordinate being on-site the same day but so far our experience is that you basically sit in the office talking to the same people as always on Zoom all day.

Unless you're in an industry that requires actual physical presence I don't think you're going to see the same office experience any more. Companies aren't going to keep an office big enough for 100% attendance when there's only a need for a smallish fraction of that.

I'd start looking for other ways to scratch that socialization itch.