To those countries that already flattened the curve, there are still chances of having second wave unlike to those countries that still haven't achieved to flatten the curve but rather increase more in positive cases. As long as the virus is still out there and the vaccine is not yet discovered, it is still alarming and dangerous for all of us.
We can avoid that so-called second wave if we continue to practice and adopt the new normal in which everyone is now learning from the pandemic. We don't need to crash the market back to nothing again as the pandemic hit surprisingly. If we care about today and in the future, we have to seriously follow the health protocols and what WHO had said. But if we are careless enough to bring back into our lifestyle before we have this pandemic, then to expect the 2nd wave will surely come. And the worst-case scenario is that we have left nothing and yet we aren't recovering that we can able to sustain at that time.