Castrum Lacus Litore declining participation

[Vahlnir]

Chances are they'll make it mandatory for the next patch that you can't continue until you beat it, which can incentivize participation or even tie the next relic step behind it.

It already is tied to progression. It's part of Bozja's story, so you probably won't be able to progress to the next area without completing it. That incentive already exists, but without the proper rewards...players who are already done with it have little to no reason to do it again. THAT is the issue.