Hello @Akshit,
Ngrok is a development tool. Even though it is a great tool, it is not made for long running processes, even when using the premium account. In addition, since it is not a formal web server (it’s a tunneling program), it is not optimized for load balancing and other perks needed when serving production apps over the internet.
I believe the solution has already been discussed and you just need to configure Nginx, the links I provided have step by step guides. Unfortunately, there’s no magical way of doing this with just one step.