Actually you just don't give feedback to your superiors. But you really may/should plant the seeds of ideas in their brains. You discuss concepts, fundamental stuff that will grow into their brain and make them change. This takes time, patience and repetition, like educating a kid. It's actually the same, nothing has changed there.

And you remain modest and ready to learn and listen. Especially because your superiors always have information that you don't have and which might explain decisions which you don't understand, and won't without this information.

And you don't "tell", you ask about topics, and show interest.

Then you might be able to propose real help to your boss, and suggest him to delegate some responsibility to you. And that's where you have some agency to create meaningful change. Bingo.