First, I just added a bar in the header when you're on the home page that has links to two "specialized views" in it. One of these views will show only coronavirus topics, and the other one will filter out all the coronavirus topics. These should be helpful for both logged-in users as well as logged-out ones (who previously didn't have the option of unsubscribing from ~health.coronavirus to hide those topics more easily).
For the purposes of these views, a "coronavirus topic" is one that's either inside ~health.coronavirus or has the "coronaviruses.covid19" tag on it (in any group).
The way I did this was definitely pretty hacky and isn't intended to stay around over the long term, so please let me know if you notice any strange behavior with them.
Second, earlier today I set up a scheduled post in ~health.coronavirus for general chat, questions, minor updates, and so on. The first one is here, and that will continue posting every day for now. If the activity in it starts dropping I'll probably reduce the frequency, but I think it should be good as a general spot for discussion for now.
It's looking like we might be living in this situation for weeks or months, so I'm definitely open to making other changes that will help keep the site usable and enjoyable during it. Let me know if you have any feedback or suggestions, thanks!