Hello everyone,
I am playing 100nl zoom.

I noticed that I am losing too much on preflop.
I am winning when I saw flop, but I am losing bigger than it on preflop.

I paid no rake in preflop result, because it doesn't include preflop all-in.
But I am losing.

Do I have to improve preflop?
Or I have to improve postflop to cover postflop?
I'd like to hear your opinions.