Leveling past level 30

[Konachibi]

At R30 you should be able to solo R30 leves at 2-star at a minimum, are you equipping abilities from other classes to help you? ie Second Wind, Bloodbath, Cure, Shock Spikes, you can get all of those with Pugilist/Marauder/Conjurer to around level 6

Also! Do your leves in gridania region, they give more SP and are generally easier

This, pretty much.

If you prefer a bit of difficulty though keep your abilities fixed to just one class. It's surprisingly fun to play a PUG with only PUG skills 'cos you rely on stacking evasion to spam Haymaker and throw a Conussive Blow in whenever you have the spare TP, along with using Second Wind then your health gets low. Had a good many close calls but it's much more fun than being a bit cookie-cutter by having cure, shell, protect, stoneskin and all those buffing you up