How do I keep going when people ignore findings that should change things?

You surface truths that ought to change how things are done, and you watch them get a polite nod and then nothing. That wears a person down in a particular way, because it is not failure you are facing. It is indifference, which is harder to fight. Your tiredness is the tiredness of someone who still believes the truth should matter. Hold on to a hard, freeing fact. You are responsible for finding the truth and telling it clearly. You are not responsible for whether others have the courage to act on it. That part was never fully in your hands. When you tie your peace to their response, you give away your steadiness to people who may never earn it. Keep a quiet record of the truths you have surfaced, plainly stated. Some will land later, in ways you never see, when the world is finally ready. Your work is to keep laying them down. What others do with them is their reckoning, not yours to carry.