How do I stay grounded when people follow my lead without a title?

You can move a whole organization, and people come along because they choose to, not because they must. That is a rare and real power. It can also feel strangely weightless, because nothing on paper says you earned it. Trust the evidence in front of you: people follow you. That is not luck. The risk in your position is forgetting where the power comes from. It comes from trust, and trust is spent every time you use it. Lead people somewhere that serves them, not just you, and the well stays full. Use them for your own ends and it drains fast, though you may not notice until it is empty. So keep asking a quiet question: am I taking these people somewhere good for them? Let that guide your next big push. The title you lack is not the point. The trust you hold is, and it is worth protecting more than any title would be.