My I485 is taking so long, I check online and it seems that my I485 is employment based, instead of family based.

It's about normal processing time. You call USCIS to see what are they working on .

My Priority date is almost current. I 140 not applied yet. Should I go for I-140 premium processing ? Will that be helpful?

You do not need premium processing. You have enough time for regular processing.

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Is it relatively easy for an illegal immigrant to become legalized through mariage in two scenarios: 1)overstayer 2)border cros?

DACA can be renewed. You are right about overstaying visa, but border cross is not that trivial.

If you get divorced you just have to wait for extra two years before you apply for Naturalization . Good luck!

Get out of the country with J1 and return with B2

Sure, you can do this. You have to have Canadian visa as well.

How to denounce my newly received green card?

If your your I-751 be denied your permanent residence will be automatically terminated.

What kind of time limit is there on filing another 751 after failing and immigration court hearings?

You are already behind. It is not a good idea to postpone the filing. You do not want to lose it again. Do it right this time.

Can i get a driver's licence when visiting on a B1/B2 in Concord NC

No. You can get your driver license with work visa, for example.

I want to ask question concerning family based green card for a spouse

No, put everything in one envelope.

Can I Seek a H1B Through Consular Processing , Meanwhile enter on H4, then apply Change Your Status.?

Yes, you can COS from H4 to H1B. You can work in the US your visa is approved.