"Maybe a change of weight category after this, I'm a bit heavy for the category I fight in," said Oates.
After winning his first two bouts, Oates lost on a golden score to eventual champion Lasha Shavdatuashvili, and then saw his hopes of a consolation bronze medal disappear when he was beaten in a repechage fight against South Korea's Jun-Ho Cho.
Despite the disappointment, his father Howard, a judo coach, said he was proud of his son's performance, especially his third-round victory over Mongolia's Tsagaanbaatar Khashbaatar.
"The fight against Khashbaatar, I don't think he could have won it without the support of the British crowd," he told BBC Radio Norfolk.
"It was an amazing atmosphere and to score with three seconds left on the clock is the best time to score."
"Twenty-four years he's been doing judo and he's been travelling the world for 10, 12 years now. It was the culmination of an awful lot of effort."
Oates said he hopes his efforts and those of his team-mates would encourage more people to take up judo.
"I'm really hoping that we draw more people into the sport.
"It's a great sport, lovely sport for kids, it's all ages, all sizes, it caters for everyone and it's a great discipline to do."
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