What's the best CTA for my landing page?

I have a book summary app that provides 10-15 minute non fiction book summaries in text, audio, and video format. I let people access 1 book summary for free when they sign up. After that, they have to upgrade. I'm trying to find the best CTA For the landing page. Which one is the best one that you think will lead to the lowest bounce rate and highest engagement. Right now our bounce rate is too high Get started for free Access the book summaries Try it for free

When a user clicks on the CTA, they will go to the list of book summaries page where they can try out one book summary for free.