Thomas' podium finish in July marked a turnaround in fortunes for him after he was left thinking he had "done something wrong in a previous life" following crashes at the Tokyo Olympics and Tour de France in 2021.
"We have to sit down and work out what I want to do, it could be my last year as well. I want to make the most of it," Thomas, who won the Tour de France in 2018, told CyclingNews in an interview published on Wednesday.
"I don't even know if I will do the Tour to be honest, maybe the Giro. It's all up in the air, really. I wouldn't mind doing something different.
"When I won the Tour, it was nice to come back the next year to show it was not a fluke. And it was nice to come back this year as well, when people thought I was done. Now I feel like I have nothing else to prove."
The Welshman, whose contract with INEOS Grenadiers runs out in 2023, added that he would discuss his future with his wife before making a decision.
"She's keen for me to carry on. We've got our son settled in a school in France and we're happy," Thomas added. "It's more about how I feel. I still enjoy the racing and the training, the main thing is the time away from home.
"It would be nice to do something new, but I'm not also wishing it to go away quicker."
Thomas has raced the Giro D'Italia three times before - most recently in 2020 - but has finished the race just once, back in 2008. In his other two appearances, he has suffered crashes that have taken him out of the race.
