What are your experiences, and do you have any recommendations for reliable services?

I've used a self publishing promotion service, and it was a game-changer for my book's visibility. They helped with targeted social media ads and email campaigns, which significantly increased my sales. However, it's crucial to research and choose a reputable service. Look for ones with positive reviews and transparent pricing. Also, ensure they offer tailored strategies for your genre. While it can be costly, but the ideal service can provide a substantial return on investment.