How do you level past 10 in alchemy,accessory or crafting?

Neither of which actually help the unfunded.
My Kanna and Zero can kill the easy Grosso Polpo, but even with 12 runs per day I've gotten ****all from it. Leviathan is lolhavefunwiththat mode like most other bosses in this game; can't kill it unless you're already cubed out the ass.
10m per blade is 50m per cube. Not even counting the other ingredients you need, it's a LOT more beneficial for the unfunded to just shop around for 6% pre-revealed stats instead of praying this one reset they spent their level 1-120 savings on actually does something useful.

While the cubic blades aren't exactly common drops, they do drop frequently enough that it's not really much of a problem to obtain the items yourself to make cubes on a somewhat regular basis. Even more so if you have more than one character doing voyages. Also, while what Takebacker said is true about some people listing the cubic blades around 10m in Khaini, I've quite regularly obtained them for under 2m each, and they are regularly listed in bunches around 5-7m, sometimes lower. I have about 20 of each blade at the moment. Superiors drop decently from Grosso too, and because of that I'm up to 30 of them since the last patch, not including ones I already had.

It's definitely not incredibly easy and the most viable method to obtain cubes, but it's far from difficult, and assuming you can get to level 11/12 Smithing, you won't exactly have a problem making cubes on a somewhat regular basis without really spending much of any money.

Also, you don't need to be cubed out the ass to kill Livytan, either. I've only just recently begun breaking the 100k range on my Xenon, yet within the time limit I can take down 50% of its health. Making me need a bit above 200k range to kill it, which isn't exactly hard to obtain through persistently working to increase your range. Especially now with the RED Shop.