I'd argue that Mastodon and Telegram hardly count as social media (and 450 contacts on WhatsApp... come on) If someone with a site on X/WhatsApp/Instagram/FB repeats the experiment, then we might see something interesting.
OP here. I dropped an X/Twittter account in the end of 2022 with ~17k followers and… really, nothing changed. Since then, it’s safe to assume that things worsened there and everywhere. Google is the only traffic referrer that still matters. See: https://sparktoro.com/blog/who-sends-traffic-on-the-web-and-...
Then the math for conversion rate on link clicks after that, it seems like you might be talking about on the order of ten hits for 17k followers?