From O1 to EB1

There are lots of ways people become permanent residents.  Those same options are available to you.  For example, marriage to a US citizen would allow you to apply for a green card.  Of course, if you qualify, an EB1 is a convenient way to obtain a green card.  Since you are already in the US in a non-immigrant status, you would have to also adjust status if you want to avoid leaving the US to complete the process.  You could, however, leave the US once your EB1 is approved and have the immigrant visa issued at a US consulate abroad.  I would recommend you use a lawyer for a variety of reasons that have nothing to do with marshalling the evidence.