You have 2 option in here.
1. Keep it and you just use bip39
https://iancoleman.github.io/bip39/ ( i recommend run it offline, dont run it online for security!) write your recovery passphrase on blockchain and just find the private key from your address that has bitcoin on it. You can check it manually on Addreses menu and show your old address that already used. (little bit risky)
2. Transfer your btc before bitcoin gold fork to another wallet that you can get private key like electrum or etc. (safest way)
Atleast you need your private key from your bitcoin address, so you can import it to wallet that support bitcoin gold. BUT now blockchain give feature about bitcoin cash after long time, maybe you will get it bitcoin gold automatically from blockchain like bitcoin cash
Anyway dont capslock it all