Is it possible to recover a RAID 5? After losing the "/proc/mdstat" and run by mistake "mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1" instead of mdadm --assemble --scan.
It helps if you know the configuration of the original RAID5. Perhaps you have saved the output of a prior run of mdadm --examine.
There are some RAID recovery tools you can try like R-Studio / UFSexplorer / ReclaiMe
I often work on failed mdadm RAID systems and can say recovery is almost always possible. But do not perform any action that writes to the RAID member drives unless you are very sure of what you are doing. Or you will just be digging a deeper hole. As suggested by Michael Kjörling making drive images is a good first step.