Might be worth starting in c/RPG with basic questions, and if they end up drumming up a lot of conversation maybe a community is warranted? I know traveller has been around a long time, but I don't ever hear too much about it so I'd guess the community for it is pretty niche
It’s… weird. There seems to be a lot of people who play it, but you’re right: we don’t hear much about it.
There’s a Discord server (not a fan of Discord myself, I get lost easily) with tons of users (and many publishers) very much active. Even r/Traveller has decent traffic (but r/cepheusengine not so much). There’s a relatively active T5 community at MeWe as well.
Maybe most players are happy to use Discord. Aaaand maybe I should be asking over there if there would be people interested.