With two out of three dungeons down, you're almost finished with the pilgrimage. The eastern exit out of the starting town will be opened now, so head there when you're ready. Past the checkpoint there's been a landslide, so you'll have to go around the long way by first going west of the checkpoint and then around the hills to a town by a cave. The monsters around here start getting tougher and tougher you may have noticed, but you're pretty close to the best place to get money so hang in there!
Go through the caves and along the outer paths until you find a guard blocking your progress. He refuses to let you in so you'll need to head back down through the caves to the village at the bottom. It's annoying, but necessary. There is a smaller cave to the west (you may have found it on your way up) which will now have your fourth party member. It's the prince! And as the prince he can get you through the guard into the fort. There's an inn at the fort, it's unmarked but it's the building that's straight down from the western exit of the fort. The areas around the fort are the best place for money because the large dark green dragons fairly frequently drop a crystal that sells for 1500 gold. If you've been struggling to upgrade your gear, or if you want that fancy underwear from the first town, this is how to buy it.
When you're done exploring the fort and killing dragons, head out of the fort to the west to a tower that's locked. To get into the tower you'll need to go back out of the fort to the south and head to the west to find yet another cave dweller with a key. Yeah, there's not one but two backtracking segments in a row... Anyway, with the key in hand you can get into the tower itself. The monsters in here are the toughest in the game, but there's an inn halfway through, past the first boss. You'll want to be around level 15 or so to beat the game, and I would recommend having some good healing items as well since the final boss battle will begin with one of your party members dead and one at 1 hp. It's a tough battle against multiple strong opponents who heal but they're fairly weak against magic so use Min'as strongest spells and Kasumi's attack spell whenever possible and you should win as long as you can recover from the way the battle starts. After this it'll be mostly cutscenes to the end of the game!