Barca were thrashed 4-1 by Sevilla, with their former player Alexis Sanchez opening the scoring from the spot before Isaac Romero, Jose Carmona and Akor Adams also scored.
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Cubarsi conceded afterwards: "It's a difficult pitch, but we came out feeling sleepy and lacked intensity. We have to improve in many areas. We improved in the second half.
"We have to push like last year; everything starts from the top. Today is a turning point.
"It's a different season. I want to improve, and both the team and I have to take a step forward."