I Am A Word Of Five Letters! The More I Am In People's Life Better Their Life Would Be.

Guess me:
I am a word of five letters!
The more I am in People's life better their life would be.
If u remove my 1 letter I will be one of the name of krishna.
If u remove my first 2 letters I will be a form of conjunction.
If u remove my last 4 letters, I am a vowel.

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ANAND