Here’s a few ideas:

- Try scheduling explicit hangout time, either 1:1 or group (have a happy hour, play some games, just chat).

- Ask if any of your coworkers would be interested in coworking in person. Doesn’t have to be a whole company thing, fly to one coworker or maybe a few people live in one spot. Most major cities have coworking spaces with reasonable day pass rates or you can use a coffee shop if budget is tight.

- There’s a lot of virtual office products out there (e.g. Gather, Remotion), see if there’s any interest in trying one out.