The Valencia winger reveals his frustration with Mexico's displays in the tournament, hoping their group-stage exit will be a catalyst for improvement
Jose Manuel de la Torre's side ended their stay in Brazil with a 2-1 win over Japan, with Javier Hernandez grabbing both goals, but defeats to the hosts and Italy meant the North Americans progressed no further.
And Guardado emphasised his frustration with his side's performance in the tournament, believing that it was not representative of their true potential.
"We improved for this match [against Japan] but I'm sure that we can do better than that," the Valencia midfielder told reporters.
"We have a lot of work ahead of us if we want to qualify for the 2014 World Cup in Brazil. The qualifiers are still our priority and we will focus on that soon, but it's true that this victory was a boost to our confidence and we plan to build on that to improve in the following matches.
"We are always proud to play for Mexico and we don't feel good when results don't go our way. But this time it was different, and we can be happy about that but not about our overall performance. We would have liked to qualify."
Guardado's thoughts were broadly echoed by team-mates Diego Reyes and Javier Aquino, who both stressed the opportunity to look to the future amid any disappointment.
"We wanted more," Reyes conceded.
"Mexico always have to qualify to the next rounds of the big events and we didn't manage to do it. Still, there were quite a few positives and we will build on them to improve for the future."
Aquino added: "This was an interesting competition. We couldn't qualify but we have to take the positives and try to build from that."