Is there any way to play the game as DPS? Or just end subscription?

[Risvertasashi]

This. I play DPS because I play this game to relax and have fun, and I don't want to deal with the pressure of the whole group wiping because I made a mistake or didn't know exactly what to do in advance. There could be 1000 choices for tank jobs; it's not relevant.

Funnily enough, though, this is something some MMOs try to address directly. More or less by just making tanks so OP you don't have to do/worry about much. The way FFXIV tends to be so precisely tuned, however, I don't really see that happening here.