Hello Idk05,
You may be able to recover the notes depending on how you stored them.
If you have your notes stored to iCloud, you can check to see if they're still in the Recently Deleted folder. In Notes go to the main folders page (if you're currently in a note, select <Notes, then <Folders at the top left) then see if you have a Recently Deleted folder. If you do, you can recover the notes from there. If there is no Recently Deleted folder showing on that page, then that would mean the notes were already permanently deleted and there isn't a way to recover them.
Use Notes on your iPhone, iPad, and iPod touch
If you just had the notes stored directly to the device and not in iCloud, then you may be able to recover them from a backup if one is available. Go to Settings > your name at the top > iCloud > iCloud Backup, and see what time the last backup was done on the device. If the last backup was done while the notes were still on the device, you can restore that backup to get them back.
Keep in mind when you restore a backup, it will restore the device back to exactly what was on it at that time. So say for example, your last backup was last night at 10 pm, anything that has been added or changed on the device from 10 pm until now will be removed when you restore the backup. (Messages sent/received, pictures taken, apps installed, settings changed, etc.)
If you do have a backup that was done while the notes were still on the device, you can reset the device and restore that backup with these steps: Restore your iPhone, iPad, or iPod touch from a backup
Cheers!