Here are 5 reason why you should be utilizing a Mastering Engineer on your next release. FYI- I’m not one

Professionalism: A mastering engineer has the skills, knowledge, and experience to bring your music to a professional level. They can ensure that your music sounds consistent, polished, and ready for release.
Quality control: A mastering engineer can catch any mistakes or issues that you may have missed during the mixing process. They can also optimize the sound of your music for various formats, such as streaming or vinyl, to ensure the best possible sound quality.
Objectivity: It can be difficult for an artist to be objective about their own music. A mastering engineer brings a fresh set of ears and can provide valuable feedback and perspective.
Time-saving: Mastering can be a time-consuming process. By using a mastering engineer, you can focus on other aspects of your music career, while leaving the mastering in the hands of a professional.
Industry standards: The music industry has certain standards for audio quality and loudness. A mastering engineer can ensure that your music meets these standards, making it more likely to be accepted by labels, distributors, and other industry professionals.

Overall, using a mastering engineer can greatly improve the quality and professionalism of your music. It is worth the investment to have a professional take care of the mastering process, allowing you to focus on creating and promoting your music. Also, I strongly recommend finding a mastering engineer that you can create a long-term working relationship with. Getting to know them will greatly improve the final product!