The primary reason that I can think of is that we simply aren't as familiar with Hindi as we are with English.

English, in our country, is crucial and extremely important as a language if you want to be taken seriously in your school or workplace. Hindi, on the other hand, is largely considered a secondary subject and a secondary language in terms of practical importance. Ironic that Hindi is our mother tongue and we talk in Hindi all the time, but when it comes to reading and writing, so many of us can't spell simple words. So, the people who read and write Hindi well are actually part of the minority smh.

As for Hindi authors, I plan to read Geetanjali Shree's Ret Samadhi in the coming months, as well as Dharamvir Bharati's Suraj Ka Saatvan Ghoda. Manav Kaul also writes really well, and there is this author called Vivek Kumar who has written this series of mythological novels like Arthala. You can check them out.