Currency making? (Hit wall at 18ex)

So I've been spamming lab for a long time (since day 2) and hit 18ex pure (probably 22 with chaos included) and have no idea what else to do to gain currency other than farming lab as I am getting fairly bored of lab.

Willing to invest in other characters if need be, currently running GC Miner from Windz and have maxed gear at level 90.