The GDP data is unfortunately considered historic data and not forward looking, this is because it is made up of data which is released earlier, also the RBA hinted the GDP number wouldnt be as bad as the worse case scenario before the GDP was actually released, by saying that they believed the drop in the economy wasnt as severe as they had first expected. So the market had already priced in a not so bad number before the GDP was released. Additionally it is the second quarter data which is expected to see the biggest impact to GDP from the corona virus.
Forward looking indicators which impact the markets the most are things like the consumer and business confidence numbers, employment numbers, wage growth, manufacturing new orders, etc you can find these at the trading economics website and the RBA and ABS websites.
Also worth looking at Chins numbers (although not accurate) as a leading indicator, also the US numbers since the asx 200 closely follows the S&P futures market.
