After the 4-0 win over Swansea City on Sunday, Mackie said that QPR were eyeing the Premier League next season even if manager Neil Warnock wants the players to keep a lid on things.
"We have matured. We have been disciplined, matured and played for each other," Mackie said.
"The focus of the team was good, even when we had to be less adventurous at some stages.
"We were quite solid. They scored on a set-piece. Drogba takes them very well. In open play, we were solid.
"Let's hope that it strengthens our belief that we can challenge for the championship and it strengthens our belief we're on the right way."