Dynamis was made with the thought that Endwalker's playerboon was permanent.
We're now 6 months into Dawntrail and we've been bleeding players back down to Stormblood levels. I don't believe on the game's current trajectory Dynamis will ever fill up the way the other DCs have.

You can either move data centers or pray that they one day add cross-dc PF/DF content something they've stated would take a very long time.