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The steem price on steemit is an average calculation of 7 days ;-)

Thats worrying me more, because in past 3 days it is 1.60-170, while in previous 4 days it was still above 2.00.
What will happen tomorrow and and after tomorrow?

Leave the value of steem, does we earn the same quantity of steem regardless of value?

In my own experience that is nothing to worry about. If the steem price is low you will get even more SP because of the lower steem price and at the end a 20 dollar post from today will be worth much more. For example I had posts when steem was 10 cent worth for sure I got less sbd but the increase of the steem price made this post 20 times more worth ;-) Hope that helped.