currently have all caster classes at 50 with relic and 70/90 gear on them all, crafting 2* HQ items with no issues, sitting on stupid amounts of gil (high of 6 million).
Dude, the game doesn't exist in order to provide you with a never-ending stream of content. Maybe try doing something else for a while?

I'll never understand these threads, people hammer away at the game for a ton of time and then complain that there's 'nothing to do.' There's plenty to do; you did it. Not the game's fault.