Hi there! First, your data is almost certainly still there! We have all made this exact mistake at some point.
The good news is that the standard clean command in DiskPart only deletes the the partition table of your
drive. It does not erase the actual files. Only the clean all command does a permanent wipe. Right now, your
files are perfectly safe, but Windows just doesn't know how to find them.
But THE CRITICAL RULE:
Do NOT initialize the disk, do NOT create a new volume, and absolutely do NOT format it in Disk Management. Doing any of these will actually start overwriting your data!
You just need partition recovery software. Download a reputable recovery tool to have a try. Good luck!