How do I get over this sunk cost problem and fully quit Runescape?

After what's happened in the last 6 months, I just want to quit Runescape 3 entirely. I don't even want to play OSRS. Every single time I try to quit this game, I end up returning less than 2 months later. It's like when there's new content, it extends my will to stay. This recent roadmap is already making me feel like playing into the summer. Is there any way I can fully quit this game?

My account is eligible for a 20 year cape in less than 5 months. I am also trimmed with IFB and even on this same account I have a maxed OSRS character. I even have multiple discontinued unlocked cosmetics from a decade ago. Basically just about anything you can ask for from a 'done-it-all'. I know OSRS is thriving but whenever I play, it reminds me of RS3. I work a full time job and have a life. What can I do to get over this sunk cost fallacy hump?