Still it spins lolHi aymen,
What happened during these 3 years ? What did you do with the drives ? With the system ? After 3 years sitting on a tablet, many hard drive will freeze in position and will not spin anymore...
From what you posted and people already told you, it looks like you lost 2 drives from a single RaidZ1 vDev. A pool is not meant to survive such a loss. Considering that you survived 3 years without that pool, you probably can now accept its loss and go with whatever you have now, learning in the process how fragile RaidZ1 is and how critical backups are.
I keep it for hope that can be recovery with new updates