How long it takes to process expedited 319b ?

Consult with an attorney. Location of filing can have an impact on processing times.

You may want to clarify your question. You would not have "immigrated" if you have a US birth certificate.

My b2 visa was not cancelled

If you overstayed for one year, you will be from readmission for a period of 10 years once you depart the US. Consult with an attorney.

That would probably lead to a conclusion that you have violated your status. Consult with an attorney.

Mariage

The W-2s are required to corroborate the earnings info indicated on the tax returns.

After my daca is approved I am in NY can I visit my family in Las vegas,St thomas & Hawaii?

If you are traveling anywhere outside of the US or its territories, even on a connector flight, you should apply for and obtain an Advance Parole...

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Process to revoke post completion OPT EAD (while the application is pending with USCIS)

You would send a letter to USCIS referencing the receipt number for the filing and requesting to withdraw the application.

This doesn't appear to present a major problem, but ity would be best to discuss with an attorney.

H1B or U visa..?

You could file for it, but as far as USCIS is concerned, you will have only one nonimmigrant status. Consult with an attorney.

Is dropbox eligible when the employer is changed from the previous stamped H-1B visa?

You should discuss this with your company's immigration counsel.