It's hard to do any one of those, let alone more or all, when you're approaching burnout.
> - stay out of product meetings
I started to avoid product meetings. Still burned out.
> - not actually care how cool and interesting and useful the product can or will be
I started to not care how cool or interesting or useful the product can or will be. Still burned out.
> - Only give feedback to your inner circle (manager, peers) when asked about it
I started to only give feedback to my inner circle. That was even more painful, and still burned out.
> - enjoy the tasks assigned to you however dull or basic they may be after you mastered them
I could never enjoy tasks assigned to me when they're dull and basic things I've mastered.
> - Be proud of your work.
As for being proud of my work... well I'm always proud of my work. I still burned out. I don't want to even touch the things I'm proud of.
Everyone's story of burnout is uniquely different. There's no single magic bullet that works for everyone.