Yeah I know what you mean, I’ve reached a point where I can just about stomach going there if a Google-search finds relevant information on something I’m researching, but I draw the line at active participation or even logging in.
I’ve done a quick search and found a list of Discord boards that are tagged with #grammar.
This one looks promising, and the list says there are currently 20 people online (take with grain of salt, though): The Grammar People
If you could share your specific question, maybe there’s more research that can be done (or maybe someone here knows the answer) 🤔