Cracking too slow

[Kulahin]

Hi there, 
I'm using hashcat to find my password to ETH wallet.  To be honest, just a part of it, because I know first 6 letters from 12. I tried mask attack, where first characters are known and the rest 6 chars are defined in my charset - just small, capital letters and numbers. I used mode 15700. My problem is that hashcat shows time to end searching... 2 years. I thing its way to long, because I have good graphic card, Geforce rtx 2070 Super, 8GB. 

I tried to instal drivers again according to instructions from hashcat page, but it didnt help. What else can I do?

ETH wallets brute only on CPU