The playmaker managed 13 goals and 10 assists in all competitions during his first season at BVB, but has now insisted that he wants to move to the next level under Jurgen Klopp's guidance.
"I'm going to try to do more this season," said the attacking midfielder, according to the official Bundesliga website.
"I'll do my best. I don't want to stay at this level of performance; I want to build on it. I always try to give my all in every game and in every training session to make our supporters happy."
Dortmund get their Bundesliga campaign going against Bayer Leverkusen next weekend.