Testimonials in order

HI I promise I am not spamming. I really want to know how I change the testimonials so they can go into order.
Is there anyone out there that I can hire to do that for me? I have 2,600 testimonials. the testimonials for 2017 don’t even show up.
I have done the publishing date- nothing changes. The testimonials are all dated. What do I do?
Thank you.
Here is the link: https://natureday.com/testimonials-pictures-voice-testimonials/