Your RAIDset has failed beyond it's ability to function. RAID5?
It will not heal itself or recover.
Until that can be resolved there's no way to access the data on those drives.
Since files are not stored individually on each drive. The data is striped across them.
You probably want to consider sending the drives to a recovery service to have them cloned and as much data as possible recovered from the defective ones. That could allow the RAID to recover and boot up. There could be some missing data.