Progress can boost because it docks on Zvezda. Dragon doesn't, so you'd need a new docking method. There was a proposal to use a VASIMR ion engine as an experi

Progress can boost because it docks on Zvezda. Dragon doesn't, so you'd need a new docking method. There was a proposal to use a VASIMR ion engine as an experiment to boost ISS, but that proposal was dropped a few years back. Had it been kept and worked then perhaps it could have worked, but it used a lot of electricity to do so