WordPress Website Updates, Content Transfer & Mobile Optimization -- 2

I have an existing new WordPress website that needs some updates and improvements. I also have an old WordPress website, and some content/data needs to be transferred from the old website to the new one. I have already added some of the data, but the remaining demo content, text, and images need to be replaced with the actual content from the old website. I also need Google Reviews added and displayed on the website, along with improvements to make sure the website is fully mobile responsive.