Welcome back to Trickster ! Where are you in the game right now ? Around your level, you can be doing Mermaid Dungeon quests.
Valese wrote a nice Key Quests guide here
you can use to easily gather items for npcs in each area.
And if you haven't been working on episode quests, I suggest those too as they are good exp / tm exp. You can start Episode 2 quests around your level [though I think that means you have had to complete Episode 1 and 0, and whatnot]. Episode Quests - ggFTW Trickster Wiki
Stone Strike is recommended, especially if you feel like you're not doing enough damage with your shurikens. However, it's not as accurate, but it does have good damage. In later levels, it's great because it's MP usage is pretty low.
I assume you're going to be a thief master for 3rd job ?
I recommend getting Precise Pitch [Lvl 5 for now] and Chain of Knives
. Chain of Knives is a strong skill~ Though beware of the MP cost, it is quite high in my opinion when you're at lower levels.
I also suggest Lucky 7 and Aura of Luck [which requires lvl 1 Armor Destructor]. You'll find them useful later for Landmine damage [if you want to get that skill], and Aura of Luck is a also prerequisite for Hide.
I'm not an expert at this by the way, I'm just listing some skills I got so far and found useful.
OH- also this is in the wrong section. Post questions about character types in the character type forum here. /forum/trickster-onl...aracter-types/