There is no need to wait, you can power up even small amounts. You will need to go to market and convert to Steem not use blocktrades as they take a fee for what you can do for free.

Coin Marketplace

STEEM 0.67
TRX 0.10
JST 0.075
BTC 57561.05
ETH 4663.25
BNB 623.35
SBD 7.28