If you haven't noticed already, we're huge fans of Grammarly.
Grammarly is a FREE third-party service that provides an automated proofreading tool. They have extensions for major browsers to make this process simple. We highly recommend using their extension; it is an excellent second set of eyes to help you avoid mistakes like typos and punctuation errors.
Grammarly also provides a premium service which we highly recommend. The cost of the premium service may be a deductible expense on your taxes, but please consult a licensed tax professional.