I485 re-filing and stop payment?

What were you thinking? This appears to have been a number of big mistakes. Meet with an attorney and stop 'stopping' payment and attempting...

No, the lawyer can not convert Consular Processing to a COS as part of the RFE response. BUT, they can file an amendment in addition to the RFE...

What is the right way to apply for COS from F1 to H1B after approval as consulate processing - i539 or i129?

This question is best answered by the company's immigration lawyer. He/she needs to file forms with CIS, which you can not file.

There is no specific number ... BUT, it should be INFREQUENT and OCCASIONAL ... more like a hobby than a profession.;

Do I qualify for DACA if I came in america in 2005 when I turn 19 years old

No, unless the DACA program changes, you were too old when you entered the US.

What is my immigration status?

You forgot to tell us why the greencard application was denied. You also left out whether or not your spouse is a US citizen.

H4 EAD which one to use ?

H-4 EADs are not connected with your husbands employers. Use the most recently issued document.

Entering US on B1/B2 stamped visa while I-130 is in process?

Yes, the B-2 can be used for SHORT visits during the 20 year wait.

This is a repeat question. Yes, the CBP officer can look up the automatic extension of your CR card in their computer database.

I-130 petition from US-citizen mother for UK-citizen son unmarried over 21 years ?

It will take 6-1/2 years from when the I-130 is filed before the unmarried son can get an immigrant visa.