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Two mechanisms will make us all less susceptible. Herd immunity we hear about regularly is when a high proportion of the population has resistance. Some diseases like pertussis and measles require a high level of over 90% of the population to have this immunity while others a lower percentage is all that is needed. We have no idea on what level is necessary for COVID-19 to drop from this mechanism.
The second is attenuation. As viruses pass through mammals the infectivity of the virus decreases. Live polio vaccine is an example of using this mechanism where the virus taken by mouth has been weakened to not cause disease in patients with intdact immune systems.
Finally treatment. The only sure treatment is using convalescent antibodies from a recovered patient's plasma. Obviously not first line.