Reliable author who can be trusted

I am looking for a reliable author who can be trusted to write non-fiction content. The subject matter will be self-help, and the desired length of the content is a medium article, which is between 1000-3000 words. The ideal candidate will have experience in writing self-help content and be able to convey complex ideas in an easy-to-understand manner. Good research skills are also a must, as the content needs to be informative and accurate. Furthermore, candidates who have experience in ghostwriting and have a portfolio with similar work are preferred.