Ho do I level up a smurf

Ok with all the new rewards you get while leveling up an account I thought now woul be a good time to make a new account. So what is the fastest way to level up a smurf, I know I could buy xp-boosts and I probatly will but is there an other way to improve the xp I get? Also can I have multiple accounts on one e-mail adress? -thanks for your help-
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