> On a related note, the moment OP resigned from their L1B job, I am fairly certain they needed to leave the country in 60 days or so. It may or may not affect them when they pursue citizenship.

Just a technical note that it won’t affect them at all. When you apply for an employment based green card you can actually have arbitrary amounts of “unlawful presence” before your most recent admission to the US. The Immigration and Nationality Act explicitly allows it. The challenge is generally recentering the US after being here unlawfully, but it seems OP already did this on their new O-1.