The 30-year-old utility is in his sixth season at the Roosters in two separate stints but will join St George Illawarra next season before linking with PNG Chiefs for two years from 2028 as a foundation player.
The Roosters are in the top four and have a red-hot chance of winning their first title in seven seasons. Watson was at Newcastle when the Tricolours went back-to-back in 2018 and 2019 but he has played 116 games for the club and said he was "very keen" to taste premiership glory.
"I've been thinking about it, going out on a high like that," Watson said after the 24-18 win over Brisbane on Friday night.
"There's a fair bit of change coming and a lot of guys that I've played with for a long time that are moving on, so I want to make the most of it."
Watson will experience a variety of environments in a club and cultural sense over the coming years.
"It's strange, it's exciting, it's all of those words," he said.
"For me, I'm a bit of a last-minute planner too, to be honest, so my missus and mum will probably be driving it a bit more than I will.
"I really want to make the most of this last six months that I've got with the Roosters. We just spoke about winning a comp, that's all I'm sort of thinking about, but then in the back of your mind you're sort of looking towards the future and big change.
"I've been at the Roosters for a long time. The next three years that come after this one will be a lot of new experiences and some really exciting stuff, so that's all going to be great and I'm looking forward to that, but my priority's here."
The Roosters at their best have shown this year they can play a tough, scintillating brand of football. They have also had several error-ridden performances, but the good displays have been more prevalent.
Watson said a premiership was achievable if they play to their potential.
"I think we do it in stages, definitely," he said.
"Our ceiling is that. It's just about our floor. I just think it is all about the consistency in our football … that's the biggest thing."
The Roosters were below their best in the first half and trailed 16-12 but dominated the second stanza with prop Naufahu Whyte and the pack taking the lead.
"There's a time and place for moving the ball, but we probably did that too much in the first half," Watson said.
"So we just went back to letting those (big forwards) run through the front door.
"When you're playing behind a forward pack like that, you then start to get fast play the balls and into that war of attrition. We came out on top of that."
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