Efficiently farming Gald and Experience is vital for late-game progression. Utilize 'Lord of the Land' blessings that increase Gald and EXP gain. Equip accessories with 'Gald Up' or 'EXP Up' skills. Repeatedly clearing high-level optional dungeons or EX Dungeons is an excellent way to gain both. Certain enemies also drop more Gald or EXP than others; identify these and target them. The 'Battle Act' system, which grants bonuses for specific combat achievements, can also contribute to faster leveling. Consider using the 'Grade Shop' in New Game+ to carry over Gald and EXP bonuses for subsequent playthroughs, making future runs much smoother.
