For the Affidavit of Support, is it consequential to show assets even though my income exceeds the minimum Income Requirement?

If your income is sufficient, even negligibly, then assets are not necessary.

If someone submitted a form i130, but they could have done an i730, could they withdraw the i130 and enter the i730?

Yes you may withdraw the I130 at any time.

No the forms do not need to be notarized.

Not unless she has continued visa status as she will not be adjustment eligible until visa becomes available.

Got my 10 year green card end of November 2020, if I get divorced now can it cause immigration issues?

It depends on the information provided to USCIS. Consider consult with an attorney for guidance.

Yes those documents should be sufficient to establish your domicile.

Contact NVC to indicate intention to adjust status.

Yes you may and this should not impact naturalization.

I applied for H4visa extension on 06May2020,and my I94 expired on 07may 2020.so how many days I can stay in USA.

Yes you may remain until a decision is made.

I-944 household member question?

Yes the son would be included as household member.