Currently the game has a system that requires you to be present in a given place to access a particular Mission / dungeon to do. It is a system that in my opinion makes it very tiring over time.
While you’re waiting at a point that a party is found on Search Party, you can spend a few minutes and even hours stopped doing absolutely nothing in the game. And it becomes something really tiring. I lost count of how many times minimized the game to watch a video, listen to some music or read something on the net, while I waited for Search.
The suggestion that I leave here is to launch a Finder option in the game, which could be on the list the Missions and Dungeons released / allowed for you.
This would allow a player, as I am, could do your quests, mobs, playing in general while waiting for the Mission / Dungeon.