Yes they can request another extension.

Talk to an immigration lawyer ... your prospects for fighting this do not look good.

What are my option on below scenario ?

What did the RFE ask for? Have you talked to your DSO? There may be special rules that the DSO will know about.

H1B Transfer filing 3 days after grace period?

Chance? yes Guarantee? no BUT ... what did the lawyer who filed the papers have to say about this?

Hello? I came to the USA with a K1 visa. When I got here my ex was abusive and threatened me Many times. I called many people

If you didn't have a lawyer help with the VAWA papers, talk to one IMMEDIATELY.

Are I485 applications being delayed due to the COVID 19?

Relax and stop contacting them 'numerous times' ... yes, they're behind. But, some cases are now being approved w/o interview.

If the company lays you off ... that will be a good reason for the switch. BUT, fear of being laid off ... and wanting more money can be viewed...

I don't know what a 'ewfiling' is ... perhaps you meant 'new' filing. If so, that is usually quicker than an appeal, especially since the...

Will I receive stimulus pay for covid 19?

You are both non-resident aliens from an immigration standpoint. But, must pay taxes as if you were a resident. More details still need to come...

I-130 PETITION

I agree with my colleague, there is no simple answer many factors come into play.