Can a U.S. Citizen help speed up the process of approval for asylum seekers?

there is nothing you can do to speed up the process.

One J1 visa at a time, complying with home residency requirement or getting waiver on one before proceeding to next.

I am applying for b-2 visa. However, I lived in the States for 20 years when I finally decided to leave the country 5 years ago

Unfortunately, I don't think that, having lived here for 20 years, thereby, at least, bringing up the issue of being an intending immigrant, and...

N400 Part 9 Question

You can write none or not applicable where it seems appropriate.

I got my permanent residence renewed through divorce as an abused spouse

Select "other" and explain that you are applying as a VAWA abused spouse.

On fingerprinting

Yes, you will receive a biometrics appointment.

DACA FORMS?

She can do it on her own but it would be better to let an immigration attorney take a look.

Brother of US citizen

A visa petition filed by a citizen brother is classified F4 and has a waiting period of around 13 years before it's priority date is current and...

For I-130/I-485, when submitting foreign passport, do I just send biography page and visa page? Or copy every page?

Biography page, visa page and any page that contains a stamp.

I-130 asks place of marriage. Is that literally where the marriage took place, or where we got the license?

place of marriage is where the marriage took place, not where the license was issued.