Easy Way to Import into New Theme?

Hi – I’m switching themes and copying all content over manually. Is there an easy way to import ONLY my testimonials from my old theme’s wordpress dashboard (or via ftp)? Or do I need to copy each testimonial over manually?

You don’t seem to be supporting this plugin any more? Is there another one you can recommend? I was looking at this page but feel overwhelmed:
https://www.wpbeginner.com/plugins/9-best-testimonial-plugins-for-wordpress/

thanks! Val