What will change for Amish people if socialism prevails ?

Well if socialism was to ever prevail, which is not going to happen under Biden, then they would all be able to get free healthcare at the point of service, based on their and their families needs, not ability to pay.

Just imagine living in a country where no one has to ask themselves if they can afford to take a sick child to the doctor, get medicine or an operation they need.  

The USA has the highest infant mortality rate in the modern industrialised world, these are babies which were wanted.  Republicans are forever claiming abortion is murdering babies, yet once a baby is born they cease to care if that child gets sick and dies because the parents are poor.

How would it be to live in a country where no one goes bankrupt because they or a loved one gets sick.  Medical costs are the biggest single reason for personal bankruptcy in the USA.

This is something everyone in the modern industrialised world has apart from Americans, whatever religion they believe in.