One of the most essential components to the music creation process is the engineer and their level of music production understanding or expertise. The biggest make or break for a record can be the mixing and mastering or lack there of. You need an engineer for their unique ear, their understanding of frequencies and song-enhancing tools and their overall ability to make your song a hit, to name a few.
Take time to research your engineer, don't just work with anyone! If making music is truly your passion don't skip the fundamentals that could intensify your chances of making it in the business. It may be costly but quality sound isn't cheap, for artists and music enthusiast alike check out this video below that helps differentiate between mixing and mastering.