I got paid a 1/3 of the work that I completed with the customer that I sent the notices to file a lean, but they only paid me for the recent work not for the old stuff. What should I do next?
You should retain a construction attorney to evaluate your legal position and to provide advice.
It may be that you can apply the payment to your oldest invoices, but only if the payor did not specify how the payment should be applied.
You should consider proceeding with a mechanic's lien for your unpaid work, but only if you have properly provided notice to owner and original contractor (if you did not contract directly with the owner).
Again, consult with a construction attorney as to your deadlines and options based on your documents.
Good luck.