Definitely would recommend the Rands Slack channel though only catch is you need to be in some sort of engineering leadership role (not sure if the criteria changed though). But I’m sure if you ask nicely, they’ll let you in. Lots of channels related to career advice there
Also would recommend just going through this huge list of tech companies that use Slack to see if any of them fits you: https://bloomberry.com/data/slack/
+1 for Rands Leadership Slack, it's a great community. While the general slant and audience are eng leadership heavy, there are definitely non-engineer and non-management folks there.
Also would recommend just going through this huge list of tech companies that use Slack to see if any of them fits you: https://bloomberry.com/data/slack/