You kinda screwed up already, since you're only lvl 23 I suggest you start all over.
But here's an alternative if you don't want to start over:
You can do cursed heart quest to delevel your masteries, though you will lose a lot of money (wich you obvously don't have) and then start farming later on, but you should really start over, here's why:
As a pure int, never take Force mastey, basically it's useless, what's a bit good is the passive, but pure int doesn't need that, you already have enough mp.
Don't take cold, for nukers to deal most damage take fire and lightning for speed and buff.
Ksers mean kill stealers, those are people who attack your mobs (monsters) and steal it.
Nukes are certains books (skills) that pure ints use, those are accessable at lvl 30. They are ranged magical attacks, cold looks like a sphere of ice, fire looks like a fireball and lightning...well...electrical attack
Gap is the difference between your highest mastery lvl and your character lvl.
That means that if your highest mastery lvl is 21 (in your case it being fire) and your current character lvl is 23, then you have a 2 lvl gap.
Start over, if you want to farm sp, it's easier/faster for int chars, keep a 9 lvl gap, mastery 7 and char lvl 16, take a bow, preferable sos bow and go to Bandit Den and farm there, make use of sp calculator (there's a sticky and ain't hard to find), see how much sp your char will need and farm that much or whatever the amount you want.
You could use cold tree to increase psy def, but don't take cold nukes, take fire and lightning because they hit harder.
)
now i know what to do 
