Welcome to the Lemmy network.
There is a pretty steep learning curve to this, and there have been a lot of little tweaks to the install that it's hard to know for certain what is causing your problems.
Lemmy does not bring in messages automatically. You have to subscribe to each community from one user on your server. I see some of your listed communities have zero subscribers: https://globe.pub/communities?listingType=All&page=1
You also have many that do list 1 subscriber, did it ever go past "pending" for that one user to "joined" for the community?
Are you running on Ubuntu 22.04 server? How did you do the install?