What suggestions have you tried so far ?
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.
Sorry to hear that. First, stop using your SD card in case of data overwritten. Then you can use SD Card Recovery tool to help you scan your SD card. If the disappeared pictures and videos can be scanned out, you can recover them back easily. If no, maybe there is no possible to recover them back. Usually, it's free to scan out data on SD card. Just have a try and good luck to you.