The world No.1 bowed out in the quarter-finals at the ATP 1000 tournament, suffering a 6-3 4-6 6-2 defeat to Daniil Medvedev.
Djokovic has struggled after winning his 15th grand slam at the Australian Open, holding a 5-3 win-loss record since the tournament in Melbourne.
But the 2016 champion at Roland Garros still feels he can get back to his best before the Major begins in Paris on 26 May.
"The French Open is the ultimate goal on clay for sure," Djokovic said.
"It's expected in a way, for me to peak at that tournament and that's what I'm aiming for.
"This is only the first tournament on clay and it's a long season so let's see how it goes."
Djokovic is next expected to be in action at the Madrid Open, which begins in early May.