file system check exit code is 8. on External HDD

Hi everyone, i got problem with my external hdd ( seagate expansion 2 TB ) i tried so many things

• first aid on normal mode and get error 8
• firs aid on recovery mode
• fsck_hfs
• scan with with seagate seatool and there is no error

i can see my hdd on disk utility but i can't do anything.

i search every site on google and couldn't find anything about it, i have 1.8TB documents in it and they are so important. I scan with Easeus and it take 1 day to finish but i couldn't get my files by names and most of them was broken. Is there any other way to fix this? and get the file back, thank you...