What becomes apparent very quickly outside the imposed rigidity of a physical office is that different individuals and different roles all have different optimal communication patterns. And people can get really fussy if they aren't getting the structure/tools/freedoms/whatever that they feel they need.
And so the answer to your question is ultimately much more idiosyncratic than you're hoping it to be. Whatever answers you find here, take them as inspiration for things to try out rather than specific things to do.
With that said, effective communication patterns tend to naturally snowball, so if you can start getting people feeling connected and collaborative, you'll find that they'll naturally keep that up and build on it.
But you are going to need to throw some spaghetti at the wall to see what your team needs in order to get that process started.
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