I've realized not to bet on any social media.
For example, pre-Elon Twitter, I thought Twitter was going to around a long time and I would continue to use it for many years. I left Twitter when Elon bought it.
While I'm on various social media sites now, I can fairly easily pick up a new one as I see fit. And if my audience doesn't want to follow me there, they don't have to. And I can find different people to follow on that new one.
You never know what is going to happen.
if you are always looking for new 'audiences' it's probably just media and not social media. I use hubs my peers and friends use. IRC, email and for the boomers - Facebook.