Which Self Publishing Marketing Services

Has anyone used  self publishing marketing services  to promote their book and actually seen results? How do you decide which services are reliable and effective without overspending? Are there certain strategies or platforms that consistently perform better for self-published authors? How much involvement should the author have while using these services? I’m exploring options to boost my book’s visibility and reach, and I’d love to hear personal experiences, recommendations, or tips from authors who have successfully navigated self-publishing marketing services.