A Microsoft file hosting and synchronization service.
Hi Olivia, I'm really sorry to hear what happened that’s a tough situation. especially when those photos are important to you. Here's what you can try to recover your deleted files from OneDrive
To recover your deleted photos check OneDrive’s second stage recycle bin via the web interface look in the Trash folders of Samsung Cloud or Google Photos if your phone was syncing with them, try using a file recovery app like DiskDigger or Dr.Fone if the photos were stored locally and contact Microsoft Support to request a manual OneDrive data recovery by explaining your situation and asking if the files can be restored from server backups.
Can you confirm whether your Samsung phone was set to sync photos with OneDrive only or was it also connected to other backup services like Samsung Cloud or Google Photos at the time the photos were deleted?
Best regards
Lucky Charm