Itself / only (for emphasis)
Itself / only
Indian English: adds stress, like 'right' or 'just'.
Come today itself; I am at home only.
Right / just / even
Works everywhere: words that add the same stress.
Come today, don't wait till tomorrow. I'm right here at home.
Remember: Clear to Indian listeners; outside India, 'only' means 'and nothing else'. Use 'right', 'just' or 'this very' instead.