Butler - Outsider

Each night, choose a player (not yourself): tomorrow, you may only vote if they are voting too.

Your ability gives you a reason to speak to people and to watch how people vote. Talk to the people you choose as your master each day.
When you have found someone you (and hopefully other people) believe to be confirmed good, choose them consistently so that evil can’t use your lack of voting ability to their advantage.
On the final night, pick a confirmed good dead player who has their dead vote. You can vote with them on whoever they believe the Demon to be.