Replacement for X?

Curious if anyone has seen a new platform emerge as a replacement for X, formerly Twitter, specifically among the science, research and healthcare community. I’m a social media manager for a cancer treatment and research institution and X is a big part of our social strategy. As Bluesky and Mastadon are growing in popularity, I would love to know if any healthcare or research organizations have made the switch and if you are seeing a growing community of users interested in science or medical content.