Tax Year Prior to 2020: Books are out of balance

My books are out of balance. I own a small part time LLC with my business partner. We track (or try to track as best we can) expenses using excel. 

 

Our total assets, currently, are $23k. Our total liabilities, currently, are $28500. My business partner contributed $12k in 2019. Advice on how to get the books back into balance? 

 

Thanks