You could walk around asking lower-level people if the need help! I used to do that waiting to get Ep 3! Or you could go all the way through Aethasia fighting every automaton, starting from Engine Bay and going all the way to the Northern Slurries/the Abandoned Labs. I was going to do that to pass the time, but never got around to it. Or you could challenge yourself to getting as many specials in a row as you can! I know several people here on the forums have been talking about doing that, themselves. Or you could create crazy outfit combos (I have been known to do that from time to time) and wear them all around Aethasia to see if anyone notices.
I, too, hope they give us a lot of other quests, or have a special event like the goat invasion back in October! (Like @Goku_Ironheart said in the New Quests topic)
(Btw, you did all the quests for Baron Fairrow and the Flying L, right? And you have checked out the Abandoned Labs? You probably dhave, or else you wouldn't be posting this...lol)