well the problem with grinding in MMORPG imho is always boredom...
and i also experience it, so here's what i do:
1. try setting a goal with a time frame (ie: 99 in two weeks, getting a certain card in a week, etc)
don't aim for something impossible to do, do factor in RL allowances...
2. try do do something on a whim (ie: when hunting you suddenly wanna hunt zerom cards or whatever, just go there and do what you feel like doing)
3. explore the world of RO (ie: just go wandering about, don't grind any specific mob or any specific map)
4. don't be a perfectionist... you do not "have" to have anything, any equip should suffice, just be thankful for what you have... enjoy the game anyway and everyway you can...