Which support zone does BTC have to reach on to recover up?

On 5th of may bitcoin was trading at 39600.Decreasing from that point,it had fallen to the lowest of $25600 on 12th of may.this all happend between just 7 days.then,bitcoin surged a bit next day and since then bitcoin is trading between $29000 and $31000 till now.it has been seven days so far.
I am not a professional trader,but according to my perspective,if bitcoin breakes the resistence of $31000 it can go back to the price of $40000.