Thousands of emails missing

Hi,

I was cleaning up my inbox 2 days ago and deleting old emails when suddenly 6.5 years of emails disappeared. I did NOT delete these thousands of emails and they are not appearing when I navigate to Trash > recover deleted items. When I started I had emails dating back to 2017 and suddenly there are none dating past October 2023.... I've tried searching by date within different time frames and for specific names and nothing is working. I desperately need these emails recovered as they contained client information for my business. I also use Apple Mail and the emails are gone from all 3 of my Mac devices! Can anyone please help?!?!