For this purpose, humans have created numerous rewriting tools to save time and use all words available in the English dictionary. Rewriting tools use millions of synonyms made available to them through artificial intelligence and instructions given by the human mind. If you hire the services of a content writer to rewrite/create content for you, they will charge you a lot. Big organizations can afford this but small startups and students can never afford the services of professional writers.
For a blogger who has to publish multiple blogs on daily basis, it is tough for them to write unique content, especially when writing on same topics. In that case, spin bot tool could be used to avoid self-plagiarism and to maintain the quality on blog posts. As spinbot change synonym automatically but you can pick the most relevant synonym using out tool.