Alvarez hit a hat-trick as Atletico won 3-2 on Wednesday evening.
Afterwards, he told LaLiga TV: "We needed the three points; we needed to regain confidence with a win.
"We'd done well in recent games, but the results weren't coming in small ways. Now we must try to extend this positive streak."
Alvarez doesn't hide the uncertain and sometimes cruel nature of football: "Sometimes you make mistakes, other times you score. I worked to help the team, and that's what matters."
Now the focus is already on the next match - the derby against Real Madrid: "Now we have to think about Saturday's match. It could be a great show."
