I would at least do the progressions that had Heroic AAs, at this point it'll be cake, but of you're bored now, it won't really be tedium? Also any other old expansions with rewards worth doing...RoF+ with bags if your alts are lacking, if you have a bard, maybe work on that bard clickie list posted a few days ago, any 2.0s you're missing even if worthless now can get the ornaments after.
If you like housing at all, maybe develop a neighborhood for storage and easy access by all, with a house for 1-3 expacs worth of collects each for future alts easy access, a house for each tradeskill, the tradeskill questarcs if haven't done yet, maxing tradeskills on toons you haven't yet. Maybe building up a stash of conflagrant armor, Merc gear(for heroics) and overstock of ToL weapons for pets.
Maybe make a crew for the in-between levels 75? 100?) if you don't have one, to ease the development of future alts/crews, can take your top crew out to get them max raidgear for whatever level you want them at.
This is just a partial list of the many things I intend to get a "round tuit" (seen in a 50s porn mag decades ago lol) to eventually. And I wonder why I keep getting sidetracked from stuff.