Every retro seems like it might be the one that really sparks change and the next sprint is going to be straight and to the point. Never happens.
Something to try... Rather than looking for the big, transformative fix, look for something so ridiculously small, simple, and obvious that it would be shocking if you couldn't make the change.
If you can find one small positive change like that each sprint, it can gradually loosen things up so that larger changes can happen later.
(But if even that doesn't bear fruit, then it's a sign to start looking elsewhere for healthier environments)
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