Right now with Edgeryders we are in a similar situation like you - we have ongoing projects that have their missions, but faced with the crisis we are doing our best to shift the conversations around the things that we humans care about these days - a simple routine I could recommend is the weekly open calls to all those interested in some efforts:
Example:
Each Monday we are onboarding those people who want to find something community like to do during this lockdown: https://edgeryders.eu/t/weekly-covid2019-community-response-call/12919
Each Tuesday we are hosting themed calls on Loss of work in the times of corona - the themes will change every month or so: What to do when losing work during Covid19? Community calls each Tuesday noon
Anyone can join the calls, but community managers send more targeted invites or reach out to those who probably woudl benefit a lot or could offer expertise to also join. There is also some guidance during the calls - what we want to do, why sharing is good, what happens next etc. But it’s a group habit that can increase the collaboration overall, it doesn’t mean everyone will or should collaborate, you see?
This is simple to organise, but it takes time to keep in touch with people and connect what is being said - that’s why integrating online calls with some form of online discussion to continue the conversation tends to work, if enough attention is put into it.