The striker has scored nine goals and notched five assists in the first 17 games of the Bundesliga season but admits his achievements will be tarnished if he slumps after the German league's winter break.
Choupo-Moting had strong periods at his previous clubs - particularly Mainz and Nuremberg - but often struggled to maintain a high level of performance over an entire season.
"Schalke has definitely been a major forward step in my career and that's exactly what I wanted," he told the Bundesliga's website.
"I'm now playing for a top international club and one that's regularly competing at the top end of the Bundesliga. Now I want to establish myself and develop over a longer period of time.
"At the moment I'm doing that very well but I never considered my previous clubs as stepping stones to better things. I learned a lot at all of them, things I've been able to draw on in my career."
"We get on really well, and everyone knows he's a quality player and has done a lot with this club," Choupo-Moting said.
"And I think the club can look forward to achieving success with [him at] Schalke for a long time to come."
