- Grind mendacity tomes to buy i360 gear
- Grind Centurio Seals (hunts) to buy i330 gear
- Do the highest level dungeons you can enter and use the drops (up to i355, depending on the dungeon)
- Market board / crafting

Personally, for returners I suggest just buying a 380 weapon off the MB, and getting armor gradually via other methods, but even ~500k is too much for some people.