I'm in the sort of weird position of having worked at 3 different companies throughout the pandemic, all fully remote, and then also now having left the working world entirely to freelance. The best remote work experience that I had so far was at the last company I worked for, where I never even met any of my co-workers in person. The reason it worked well is that we had a very strong and socially re-enforced culture that worked something like this:

If you're working, you're available on chat (discord). If you're not available (like taking lunch or a break) set your status so everyone knows.

If you need to talk to someone, don't hesitate to ask.

If you send more than 2-3 chat messages as part of a discussion, just pull everyone in to a video room immediately and talk it through. (Discord makes this really easy.)

At first I was a little uneasy about being pulled in to video calls all the time, but I came to really appreciate it. I honestly think this worked better than "just turning your swivel chair" because our team was big enough that even in an office not everyone would be a swivel away.