Basic advice, increase the following:
The thead Relentless linked to is a good resource to provide inspiration and guidance toward gearing for your 300k DPS goal on a budget.
I did a quick comparison of your monk and my monk in d3up. When I brought your crit chance, crit dmg, and dex up to match my monk, you gained 53k DPS for a total of 285k. I have 3,327 dex, 53% crit chance, and 598 crit dmg. Naturally, I am not trying to imply that those are mandatory stats, but instead am using them as a comparison tool to demonstrate the benefit of boosting the status further. As Stratia menioned, leveling to plvl 100 will help in the dex department. Additionally, it will boost your survivability with vit, str, and int.
Another thought is to look at your weapons. I swapped my EF in for your MH weapon and you jumped to 311k DPS (22k increase) with the stat boosts above. Of course, if you can't stand the fear proc on an EF then don't go that route : )
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