I am a 25f marketing graduate from the Philippines. I worked in Marketing in 2016 and since 2017 I have been working for an injury firm remotely in LA through a Call Center in the Philippines. My bosses in LA are willing to sponsor my work visa to the US and eventually my green card. I also have 10 years B1/B2 visa. My bosses own a medium-sized law firm and have no sponsor experience. What's the best route I should take? Any suggestions are appreciated. Thank you!
Here are my research (not much info)
Go there on a B2 visa, convert to H1B, and eventually work on getting a green card and citizenship. My bosses will be the one filing for H1B with USCIS. Is this viable? I am getting mixed information about conversion of B1/B2 to H1B. Can I come to the US with a B1/B2 and have it converted?
I have also found L1B. My bosses have invested in a Call Center company but have different company names. Is this possible? Do they need to be declared as part-owners of my company to do so? If I'm able to prove they've been using my services for work, will this be enough to get a L1B sponsorship?