A great way to get lots of xp is to go to the ice world, go to the 10th stage and stall at the boss room. The boss creates 2 enemies every time it comes out from the ground. this cycle goes on as long as the boss is alive. also the current amount of points you need to max out your skill tree is about 229/230.
I suggest 2 things. Optimize your build and skills for attack damage, rapture chance/ damage and xp gain.
Go to the last stage of the ice world and try not to die in the boss stage? (more like a world where you lose hp gradually and fight of enemies), when you come out of that dimension you get some good xp and there is a chance to get some of the best perfected gear available in the game. At the highest difficulty you can get lvl10 equipment. Now it's only a matter of time before you achieve near absolute power.