It's not being privatized because it's extremely expensive to maintain and also it's politically impossible as several modules are Japanese or European owned an

It's not being privatized because it's extremely expensive to maintain and also it's politically impossible as several modules are Japanese or European owned and half the station is Russian and there's no propulsion on the USOS side. As to not boosting it to a higher orbit, firstly that would require a tremendous amount of energy, more than any craft currently visiting it. So you'd need to custom build something for that purpose. They're already custom building something to deorbit it with less thrust requirements than you'd need to boost it upward. Secondly the station is slowly experiencing cracking and eventually will suffer a catastrophic debris strike or depressurization. This massive object would create a massive debris cloud and putting it in a high orbit would ensure it would last for thousands of years.