Looking for Strategic Book Publishing Services—Any Recommendations?

I’m planning to self-publish my first book but want to ensure it’s done strategically to maximize its reach. I’ve heard about companies that provide strategic book publishing services to help with editing, marketing, and distribution. Has anyone used such services before? What was your experience like?

I want to avoid pitfalls like poor distribution or ineffective promotion. If you’ve worked with a publishing network that focuses on strategy, please share your thoughts or advice. Is it worth investing in these services, or is it better to handle everything independently?