Got some with 1k+ coins yesterday after nearly 5 days staking. But i think it won't be sufficient to fetch another block before 7 other days as the total amount  grows faster than my wallet weight.


It seems Yobit is on the wrong chain, so no, you won't be able to withdraw the coins you bought there.
I recommand you to sell your coins and to send BTC (or a lower transaction fees coin, i.e : LTC) to Cryptopia instead.