I mostly play on tgstation’s european server Terry, which often gets up to 100 players in the busy hours.
I know exactly the kind of anxiety you mention when it comes to having to learn a new role. That was partly why I also had the idea of installing a server locally to tinker with the mechanics in, which fortunately tgstation actually makes very easy. My problem then is that I only have like 10 minutes alone on the station before the power runs out, and I have to go set up the solar panels to continue my experiments. Turns out being solo crew on a space station isn’t all that easy.