If you happen to know a high level person who is willing to help, they can use the undersized party option to enter with you and mash all the bosses down solo for you. That avoids having to wait for matchmaking but this duty has so many long cutscenes I can understand if nobody volunteers their time. S-E aren't happy with this duty and a lot of stuff in the ARR base game which was rushed to very tight deadlines, but they can rarely justify putting resources into fixing old stuff. They are very gradually looking to improve the new user experience.