run it against wordlists. I already ran it against rockyou.txt but no dice.. You don't seem like an American/English so install some wordlists from the internet in your language. (For example i am turkish so I would search türkçe(means turkish) wordlists). Then I wrote a simple python script that reads all lines in a file and gets the 8 letter long ones then writes them in another file.

filename = input("filename: ")
wordlen = int(input("wordlength: "))
fileout = input("fileout: ")
f2 = open(fileout,"w+")
with open(filename, 'r') as f:
try:
for word in f:
word = str(word).strip()
if(len(word) == wordlen):
f2.write(str(word) + "\n")
except:
print("error")
print("done")
f2.close()

make sure you run the cript in the same directory with the wordlist!

filename: yourlanguagewordlist.txt

wordlengt: 8

fileout: 8letterwordlist.txt

the run hashcat against 8letterwordlist.txt, if the password isn't random you might have a chance