One Way:

Dear Readers

The best way to ask me questions is on Goodreads.  I vow to do my darndest to respond promptly.

If you don't have access to Goodreads and staunchly refuse to join it in the future, then please use the nearby email form to ask your question.  The upshot is that I always respond to questions, no matter the method used to ask them.

Sincerely

Jason