Just Hit Fifty! Now What?

[Dualblade]

One thing to note: As a Healer a weapon upgrade is not quite as essential as it would be for Tank/DPS, and your i90 armor will be good enough until Ishgard, at which point you'll be getting upgrades from quests/can buy from the stores. The lvl 53 dungeon drops 130 gear, so if you do have any Poetic gear on and upgraded that will be the last dungeon you'll get thats at level with you.

ALSO, make sure to talk to Urianger in the Walking Sands after completing Praetorium if you haven't already. He has three trials you have to beat in order to move on to Ishgard as well.

[Rivxkobe]

One thing to note: As a Healer a weapon upgrade is not quite as essential as it would be for Tank/DPS

This is not worth stating in my opinion. While it isn't AS essential, a weapon upgrade should be your first choice as any job at level fifty. Weapon damage increases your out going healing and dps more than any other piece of armor will offer. And the defensive stats are worth less if you are at least decent at avoiding damage.