How can I serve for museum in the field of architecture as my grandfather served the museum in 1985?

You would have to formally send in your application and given the current circumstances of h1b1 visas it's unlikely that they would allow you into the United States unless you have some fantastic credentials.

If you want to work at the Met, register on "Linkedin" you will find jobs offers.

I practice arise plaster art and have knowledge in jodhpur sandstone architecture.