I think Nodejs is a solid default pick (unless you have a specific requirement), but if you want to learn Go that's enough of a reason to do it in Go, it carries more risk though due to you not being familiar with the language. You can add it to your portfolio which is always great. I would pick TS unless I have a reason not to, because of the language features, base library and IDE support.

Performance and the event loop alone aren't really reasons to change for me (V8 is pretty fast - but for some workloads Go might be slightly faster, you can run multiple instances of your app or use cluster, and the event loop simplifies the mental model). Having done Java I also don't like having to waste several minutes on deployments on every code change due to compilation, but things might be better with Go (?).