How to stop human like spam bots from commenting on my blog?

are you using an anti-spam plugin like akismet or “wordpress zero spam” (or both)?

Not really, I actually use very less plugins.
I had tried Akismet once, but it asked me for a wordpress.com account which I think I didn’t have.

Do try akismet

Go here for information:

https://akismet.com/wordpress/

You can create a wordpress.com account in order to use akismet.

Go to the link I gave you: https://akismet.com/wordpress/ and read through it.

Without some sort of “added on” protection, you will be hammered continually with spam comments.

I went to the site link you provided, https://www.rohanvyas.com/, and was told the sever could not be found.

Is your site still up or have you taken it down until you resolve the spam issue?