A different alternative is doing sidequests, which I assume you've skipped if you've only got the one class and you've slipped behind the intended MSQ level. (I did them as I went, and I think I was gaining about a level-and-a-half per "MSQ level rise".)

You also will be able to access the Vath beast tribe quests (or will be after completing some sidequests for them).

And of course make sure you've caught up on your samurai class quests.

If you're queuing for dungeons as a DPS, you'll have some waiting time, so you can work on quests while you wait.