I have run out of funds to support my case against a big company. Is it possible to get a ruling on my case without a lawyer?

I have filed a breach of contract lawsuit against a multinational billion dollar company. A couple motions filed and deposition already done but I can't afford my lawyer to help me finish the case. Can I or should I write a letter to my judge? Can I get a different lawyer that might help me based on judgement and not billable hours? Damages could be substantial.