B-1 Visa

1. I am on H1B VISA and was notified that my employment will end on January 20th. I am actively seeking new job opportunities. Can you please let me know what happens if I am still interviewing after 60 days and become out of status? 
2. Do I have any other options to change my VISA status before/after my employment is terminated and I fail to secure a job before the 60-day period is over? 
3. Does my VISA become invalid after the 60 days or can I still find a job and reactivate it if I get an offer after the 60-days?

Have any rules changed regarding getting a spouse visa through H1, L1, or O1? Also is traveling on a tourist visa to the US after marriage not ok, with a pending GC application? Finally, does the US have any special agreements with the UK, EU, Singapore, Dubai or Australia for visas that may qualify in this scenario?

Parents came to the USA on a B-2 Visa in March 2021. I have requested an I-539 extension in August 2021 due to COVID and they stayed till Jan 2022. Eventually the extension got denied. Is this a problem?
 

I  had filed for my parent's green card in July' 2022. It is concurrent filing.

The I-130 filed by me shows processing times of 4 weeks and 6 months for my dad & mom respectively.   

The Advance Parole shows processing time of 11.5 months and I-485 (Minneapolis-St. Paul field office) is almost 2 years.

Their I-94 is expiring on the 30th Nov. What is the process to withdraw the application so that they can return back to India legally before 30th Nov?

Also wanted to know:

Will I need to withdraw the I-130 petitions that I had filed for them ?

Will this impact their existing B-2 (visitor) visa? Will it still be valid?

Would there be any issues with parents reentering the country after filing for GC application? Say the parents entered the US on a B1/B2 visa but applied for GC while they were visiting (not for the first time). They were going to file for it once they were back in the home country anyway, but decided to submit the application now than at a later date due to some health situation that came up during the visit.

Are there chances of the application being denied/or will the parents not be allowed to reenter the country because there have been some medical emergency that happened during the visit? Should those factors need to be addressed before exiting the country before the 6 months stay time is up? And would it still be a problem if that has been addressed with the provider, given it will all be in the history file now? Would there be some state assistance that anyone can get some help with in terms of financial and patient well-being and all?
 

I have worked in the U.S. under L-1\H-1B from June-2015 to March-2020. I have been in India since the last 2 and half years (Not working for any US based company). Now I have got Job offer from a US company and the H-1B I-797 petition is approved. I have a previous employer's H-1B Visa stamp (which expired last month) in my current passport, and B1/B2 Visa stamp(got in 2013 and valid till Sep-2023) in my older passport. I also have approved I-140 (EB2) from my previous employer.

My Question is due to the high wait time for Visa appointments, in worst case, if I can not secure a visa appointment anywhere close to joining date, can I travel to the US with a valid B-1/B-2 Visa and approved I-797 and later change status to H-1B and join the job? If yes, would it impact the GC process in future?