Here are additional questions that you could use on the survey to find out things specific to content marketing:
1. Why did you initially visit Website Name?
2. What’s your biggest challenge when it comes to Industry Name (Marketing)?
3. What other (Industry name) blogs do you frequently visit? (separate them by commas)
4. What type of articles on (Website Name) do you wish there were more of?
Here’s the link to an email template that you could use for a survey to send out to your audience