Group up. The game is all about ad-hoc parties. Just take a look at the minimap (you can zoom out with your mouse wheel) and find a big cluster of players. Press "teleport" and you'll most likely end up smack in the middle of a fight.
You'll propably want to find a place with lesser gods (big monsters that take lots of hits, but aren't in your mini-quests). Killing them in a group of even a few people, if there's even one healer around, shouldn't be too difficult, but I'd still advise you to be careful.
Once you're geared up so that you can take more than one hit from the big gods (but don't get too cocky, they'll still hit hard), try to find or gather up a group to kill one of the big baddies that Onyx keeps mentioning. They'll take a lot of hits and practically require a group of at least a dozen players, with exeption of few of the weaker ones.
And even though you've hit the level cap, you can still progress. Gear is the easiest way to get more powerful, but what all players really want to gather are stats raising potions. These drop rarely and only from the toughest of monsters. They will permanently increase any of your stats, thus making you a bit more capable at fighting bigger monsters and finding more. You'll find them most reliably dropped by (late game, ie. not Pirate Cave) dungeon bosses.
tl;dr Don't solo, teleport to a group, get gear and stats potions.