You get different limits when you upgrade your weapons. Level really doesn't make a difference in this game, as the monsters level up with your characters (meaning if you are level 30, so are the monsters). It seems you don't really have much magic, so draw whatever magic possible until you have 100 of each. (this could take a while, especially if you say you have a tough time with the monsters)

Basically, level makes no difference in this game. It is all about what magic you have. Draw like there is no tomorrow and remember to junction it.