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If you want to power up then get steem. Your votes will count more - for others and yourself. Or you can delegate steem power (SP).
SBD can be used for other things like buying delegation votes.
I bought steem on Bittrex and transferred it over.

Coin Marketplace

STEEM 0.17
TRX 0.16
JST 0.029
BTC 75904.17
ETH 2906.60
USDT 1.00
SBD 2.64