Creating Efficiencies for Accounting and Financial Management Tasks

I am looking for advice on making accounting and financial management tasks more efficient. I've been doing the books for my organization from the beginning (about 5 years ago). As the scope of our work has grown, the admin burden, including the books, is taking FAR too much of my time. I passed the need for help with this a long, long time ago. I keep my books in Excel. I have a professional do our payroll, because I was never going to have the time to deal with pay and benefits. I'm at the point where I probably need to "professionalize" my bookkeeping, because I am also getting to the size of the budget that I need to do audits and such to apply for additional grants.