I'm from a country with a large EB2 backlog, and I'm at a principal/staff level at a FAANG, currently somewhere on the EB2 backlog.

What are my chances of getting an EB1 if I self sponsor (with help from a law firm)?

I have about 15y of professional experience but everything I've done has been very proprietary, albeit on well known household-name products. I haven't blogged or published either under my own name or for my employers. I can probably get references from senior leaders in various FAANG companies. I don't have a PhD but I have a Masters with some publications and a few dozen citations.