If you're confident you have enough critical and don't need more, you could go for Stamina Reduction or Passive Defense.
Of course that's still up to your personal preference.
The last upgrade should be Artisan, as this would increase your damage with certain Alchemy skills.
(Up to 50 MP, 20HP, some Critical, some stamina.)
Basically reworded what Hatsune already said. ^
what would Tropa do?
Relying on 1 person's opinion might not be the best idea, as their stats and playstyles are usually different from eachother.