“Best Online Book Marketing Services for Beginners

I’m a first-time author and need help with online book marketing services. I’ve published my book but have struggled to generate significant sales. I’ve heard about services that handle everything from social media management to book reviews and Amazon ads. Can anyone recommend cost-effective, beginner-friendly services for an author just starting out? What strategies have worked for you in terms of building an online presence and getting noticed by readers? I’d love to hear some success stories or feedback on what has or hasn’t worked when hiring a book marketing team.