Unfortunately, once Snapchat messages have been deleted after 24 hours, they are usually gone for good. However, there are a few things you can try if you want to recover Snapchat messages after the 24-hour window has passed:
Check if the messages were saved: If you saved the messages before they were deleted, you may be able to recover them by going to your "Memories" tab within the Snapchat app.
Check if the messages are backed up: If you have backed up your Snapchat data to an external cloud service like Google Drive or iCloud, you may be able to retrieve the messages from there.
Use a third-party tool: There are a few third-party tools available that can recover deleted Snapchat messages. With AnyRecover data recovery tool, you can easily recover Snapchat messages after 24 hours in one-click
It's important to note that even if you are able to recover the messages, the other person in the conversation will still not be able to see them, as Snapchat's system is designed to delete messages after a certain period of time.