For those that deleted their account, how do you navigate a world where more communities exclusively use Facebook?

I deleted my account almost 10 years ago. I've had no regrets. However, I'm finding lately that more communities have no option but Facebook to communicate with others. I live in a somewhat large metropolitan city in the US but it's nearly impossible to find anything on Craigslist anymore — Facebook Marketplace has displaced it. Even local enthusiast groups or my children's school's parent groups communicate only through Facebook. I feel like a luddite when I ask organizers if there is a email mailing list or suggest to start one. Lately I've had urges to create an account again solely for these sorts of groups, but knowing myself, it's a slippery slope.