The British number one was dumped out at the All England Club after losing to Croatian veteran Marin Cilic in four sets in Thursday's (03.07.25) second round clash and felt that the defeat shows that he needs to improve his game on the surface.
Draper told reporters after the match: "I wasn't feeling too great at Queen's. I don't know how I made the semis there and gave myself a chance of making the final.
"Yeah, highlighted to me this year that I really struggled on the grass, in all honesty. I felt great on the hard, felt great on the clay. My game, I felt like there wasn't many holes, whereas, as soon as I came onto the grass, I felt a big difference.
"So it's just something that I've got to keep in mind, how I'm going to develop my game for the long-term for next year, just to get better as a player. For sure, highlighted a lot of weaknesses in my game, especially against a player the way he was playing today, someone who's as good as him on the grass."
Draper has risen to fourth in the world rankings after an impressive year so far but admits that his Wimbledon disappointment has provided him with an important reality check.
He said: "I think the last couple of weeks has been good for me to see that, even though I've had such an amazing progression the last sort of 12 months, I've still got a lot of areas that I need to improve in my game.
"In some ways that's exciting, and in some ways that's hard to deal with because I thought I was ahead of where I was."