Promoting your website on third-party authority sites is not about backlinks alone. It is also about branding and improving online and social media presence. If you need help with the process, it is wise to hire a guest posting service that can handle your requirements.
Guest posting can be outsourced, and while many services are around, you need to select one that understands your niche and can offer quality content. One of the best ideas is to place a small order for guest posts, so as to understand their work process. Content should be relevant, inspiring and must engage the target audience.