Being known as agreeable should not prevent an honest difference of opinion.

A reputation for pleasantness is comfortable to live inside and expensive to leave. Every time you agree, the expectation firms up, until a simple disagreement would read as a change in character rather than a view about the matter at hand. The result is that your yes stops carrying information, because it was never really in doubt.

Say one true thing this week that you would normally soften into agreement. Keep the warmth, drop the acquiescence, and notice that most people receive it far better than the anticipation suggested.