A good starting point would be Ifrit Hard Mode. This allows you to get the second best main hand weapon in the game behind Curtana. As you farm for it, you gain Philos and Mythos too.

Run some WP from time to time to alleviate the monotony of it. You do need Darklight to tackle the harder content eventually. Ultimately, decide the pace of how you want to play. By the end of your farming, you should have a full Darklight gear at minimum, and maybe a Relic weapon.