We will almost certainly see a 2nd wave and probably a 3rd or 4th - until a vaccine is found. It's the pattern of how these viruses work.
This is a graph of the Spanish flu influenza from 1918. Note how deadly the second wave is, much, much more dangerous than the first wave. Nearly 60,000 people per week were dying in London alone.
With covid 19, cities that had irradicated the virus are seeing it return. For example Henan Province in China