Havertz did not get on the scoresheet, but was outstanding as the Blues battled to a 2-0 win at home over Everton in the Premier League on Monday.
And the German knows he must continue to deliver consistent performances for his side.
"It is difficult to say [if it is my best performance for Chelsea] but the first few months were difficult for me," Havertz told The 5th Stand.
"I hope that I will get a lot of confidence now and carry on like this.
"Of course, it wasn't easy to come here where everything was new. I have been here for seven months now though, so now it is time to perform.
"I know that in myself, I know many people have doubts about me. I just keep on going and working, trying to help my team in every training session and game. That's the most important. I hope this performance will give me a lot of confidence. I hope to continue like this."