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You have several options:

  • By posting good content, if the whales (big holders of steem power) are interested in it they will vote your post and and after a week some steem will be accredited to your account (50% of the earnings, the other 50% is accredited on steem power)

  • By buying it with another crypto or with fiat(normal money)

  • By powering down your steem power, this will "transform" your steem power to liquid steem in the lapse of several weeks.

  • By using faucets

Usually there are some contest where the price is on steem or steem dolars.