It looks like you are doing everything right.
A nice amount of total dex, some good defense from the armour.
The next big thing to speed up your climb would be improving the weapon.
For the amount you spend, it will be more worthwhile for you that way, rather than getting a 50+ str charm or 50+dex heavy armour.
My only bit of advice is to stick with it for a few more grinds, until you are willing to buy a more expensive weapon, or else join wave cata games for items or maze cata games for faster MQs.