You should check your Quest Log book! After that go through your Backpack, and check/use Items in the Quest Tab. There is no going back to the "old world" once you take over the Battle Tower,
so having multiple saves is always a grand idea.
From the point you have your BT, your main Quest is to complete 4 tasks, all of which are in Orobas Fjords. Don't forget side quest

s though...massive xp/items good times ect.