Curious, why not instead contribute your valuable Go expertise towards matrix (specifically the homeserver called Dendrite)? Certainly don't want to take away any of your passion for xmpp...but if you haven't read up on on matrix in general, I encourage you to do so.

For matrix in general, see: https://matrix.org/

For diff. between matrix and xmpp, see: https://matrix.org/docs/guides/faq.html#what-is-the-differen...

For Dendrite - matrix's homeserver written in Go - see: https://github.com/matrix-org/dendrite

Cheers!