Look here to see where you should be

http://ffxiv.consolegameswiki.com/wi...ral_Era_Quests

If you just did "To Guard a Guardian" you're waaaaaaaay overlevelled, but that's no big deal.

http://ffxiv.consolegameswiki.com/wi...tive_Endeavors

is your next quest; IIRC the questgiver is in a room at the back of the Gridania Archer's Guild, so go there and see what he's got for you.

You should always get your next main scenario quest from whoever you turn the previous one in to, so abandon something or unless you forget to pick one up after turning the previous one in, it should be pretty difficult to lose your place.