The five-time Crucible champion claimed a 13-7 victory over Shaun Murphy to progress to the last eight in Sheffield on Saturday.
O'Sullivan has previously indicated he wants to either better or match Stephen Hendry's modern era record of seven world crowns but the 41-year-old now says he is happy to play a supporting role at tournaments in the latter stages of his career.
"I'm really not that bothered. I know it might sound crazy,'' he told reporters.
"At the end of it, if I was to win it I'd be sitting here saying it was a great, great feeling, but I've had that feeling five times before.
"It's nice for a few days, a week or so, but after that you think, 'Is it worth putting 365 days of blood, sweat and tears into hopefully winning the world title, to get that feeling?'
"I've never been driven by records and titles and being the greatest player on the planet.''
''I look at myself like a band or a singer nowadays. But I'm not confident of writing brilliant albums every year,'' he added.
''I haven't had the greatest of seasons - I haven't written a great album this year - but it hasn't been a bad year.
''I don't see that I need to write a great album any more, I just need to be a supporting act. I don't mind letting the other guys write the good albums.''