Just be patient. It could take weeks to months for you to receive fan mail back depending on the recipient's respond time. When I sent to Annaleigh Ashford it took a couple months, and when I sent to Helen Mirren it took less than two weeks.
"Mostly, I loved the size of these people's emotions. Nobody has emotions this size anymore. Outsized emotions. Operatic emotions. Kushemski and Vanda are like Tristan and Isolde, they're Paolo and Francesca. Nobody's in total thrall like this anymore. Nobody's overcome by passion like this, or goes through this kind of rage." Thomas, Venus in Fur