Don't do book reviews and the value of your site is in the data. What you should do is, for every interview, add a question in the form of "what books do you read" or "what do you recommend people should read?". Then for every book listed, add an amazon affiliate link (don't forget to be transparent about this - honesty is the best policy!) so that it provides some revenue and diversifies your income.

Now here is the kicker -> Add every suggested book as a data point and collate it all into a table(s) as a separate page on indiehackers! You can use all sort of filters such as number of times suggested, genre based on founder types, etc. For the sort of audience you have, there will be very interested in the number of times a book has been suggested rather than the book review itself.

Hope that helps. If you need a sounding board and perhaps a hand, my email is in my profile.