Unlikely you will find a reputable attorney to do all the needed applications for $2000. In the long run cheap is expensive

Talk to a family law attorney in your state

Both answers are no if he obtained his E2 through consular processing. Answer is yes if he changed his status from some other status in usa

Can my wife, on H4 visa, travel outside and come back while my H1B transfer is on going?

She will be fine as long as your H1b is granted or you continue working for original company. She should take her and your approval notice, her...

I need an answer ?

You can apply for citizenship 2 years and 9 months from date on green card if wife is a citizen or 4 years and 9 months if she is a permanent...

Can I work from home in a different state with my E2 visa?

You can work anywhere as long as it’s for the R2 company that sponsored you. You do need to change address with USCIS

What are the chances to get green card (F2A) approved after the officer said she needs to verify if I had maintained my status ?

No problem based on facts provided. This is pretty standard

Employer is telling me that he sent a request for H1B cancel. But USCIS shows "correspondence for Form I-129" for my petition.

This could be the revocation notice. You can try call but the petition belongs to the employer

DS260 question

Rather be safe and list all jobs. It shouldn’t impact anything that she didn’t mention it in last application if she simply forgot

Is it legal for someone to continue traveling and working on an E2 visa after being terminated from the company that issues it

They are only authorized to work for the E2 sponsor company until terminated then they are out of status