Can we file a mechanic lien now?

We are a subcontractor hired by a GC - the GC has not paid us. Our last date on site was 7/25/22. What can I do within that 90 day deadline. How long do I have to file a lien? If I am not within the deadline what are the other options? What are the definitions of “the project” as it relates to us regarding the 90 day deadline to file after “substantial completion of the project.” Our portion of this large project is about 6 months of work, while the entire house remodel will take around 2 years and is run by a GC with many subs. Is our deadline the last day we worked there? Or the last day the GC worked there? Or some other deadline. We have been waiting for the client to schedule us for the remaining $19K of work we have left to complete the project, which is why we have not yet filed a lien. The total cost of the project is $130,490.00. We have billed $111,345 and received $94,194.00 in payments. The $17,151.00 balance due consists of $11,134.50 on 90% invoices, and $6,016.50 of 10% retention invoices.