They actually just expanded it to the second expansion, so you now get the base game of A Realm Reborn, as well as Heavensward and Stormblood included in the free trial.
It’s also releasing for beta on Xbox later this year (currently it’s PC and PS4/5) so there’s due to be a new influx of players as well, so it’s a good time to start playing. That and the new expansion is due out in the new year too.