[Cyclamen]

IMHO, the problem isn't *learning* kanji... is actually *remembering* them.
You can spend hours on textbooks, kanji lists, flashcards, writing, remembering stroke order, practicing every yomi possibile... but if you don't use them often, you won't remember them.
At least, that's what is happening to me. If I don't practice everyday I forget kanji very easily.