People can run in their way; you can run in your way.

If your run is ruined, then you need to do some thinking about how you play for the next event or the next day of this event. Such as making your own party. Such as increasing your equips/build/etc so you can defeat the boss on your own, even if a bit slower.

While I was still running yesterday, it did not seem like most people were leaving. The lowest I saw was me and another player and the boss was easy. When the playerbase were all lower level and Hugthulu regularly killed us, we had to use strategies to defeat him. No one notices those anymore because they prefer to just overpower the boss; you can still use those strategies.

Anyways, just as with all events, you might need to be prepared to solo. It was the same with previous events, such as the Goblin Mother. You just have to do some prep work and prepare yourself.