As market drop down and value decreases all of altcoins and btc that's why affecting btg and it's prices decrease as others but when it will go up and than go to his peak so say it that bitcoin gold have a good future.
currently the crypto market is in a bad condition so the price of almost all coins has decreased so I think the future of BTG depends on market conditions or the conditions of Bitcoin. if Bitcoin can recover, then chances are BTG will also rise.