How do I validate my idea?

This is so generic advice, i didn't even think about any revenue model now, I am looking for specific actionable things to do to validate the idea like running ads with figma prototype, something like this

Toh bhati g ... Kar Naa

I mean yes, because I can convince my friends and family to use it but I don't know if others and their friends and family will use it or not?

dm me if you want, i have vast experience in validating ideas

I can't tell that here, because I have already talked about the idea on twitter, I am very much active on twitter, so it might throw away my anonymity here