I've written to a few sci-fi authors who wrote amazing books that shook me in a good way just to say thanks and how much I appreciated their work and never hear

I've written to a few sci-fi authors who wrote amazing books that shook me in a good way just to say thanks and how much I appreciated their work and never heard back. In highschool I read a book by a well known astrophysicist and wrote him an email about getting into physics. I was delighted by a page long reply that gave me some pointers and insight. It may seem nerdy, but I really learned a lot from him and respected his communication style. It's a fond memory I'll forever hold onto and hope I can be as gracious someday. As much as I wish I could be a physicist, my mathematical skills are a bit more limited, so I went into engineering instead which is also hard and involves plenty of math, but doesn't require solving differential equations as a key part of my job.