What is the fastest way to level up my Maplestory character?

I am a level 17 luckless mage in Khani named poopibeast. I have joined a guild and they want me to level up as quickly as possible because everyone in the guild is over level 50. I was wondering what the fastest way to level up is. Is it straight up training or doing pqs? Or any other ways?
Update: I don't want to join a private server. My friends are in MapleGlobal.
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