Recover notes that disappeared from Iphone XR

I bought an Iphone XR in May of 2019. I transferred everything from my old phone to my new phone, including my notes. I have added many new notes and changed some I have had forever in the last couple months. I got into my notes on Wednesday and they were all there, however, on Thursday when I went to get into my notes on my iPhone, they were all gone. I have tried all kinds of ways to get them back with no success. I have tried to check notes on iCloud and there are only 5 notes there, not all of the notes I had previously. My phone was backed up on an old computer that I no longer have access to. How can I get back all of these notes? I have recipes and family birthdays and address included in these notes and I am not sure what happened to them, for all of them to just disappear in less than 24 hours.