Hello TheTravellingFreelancer,
You want to make the whole content clickable ? Already the image and Title is clickable and we are not focusing on the readmore button. If you are familiar with WordPress code, please edit the code with reference link. https://codex.wordpress.org/Function_Reference/the_permalink
If you need customization you need to hire for the customizer for the dedicated customization.
https://codex.wordpress.org/Function_Reference/the_permalink
Best Regards,
Acme Supports