Plasma propulsion for in Earth Atmosphere (I’m not saying for other planets in the solar system) isn’t practical due to the ionising radiation.

For planetary bodies with little or no atmosphere, relative to their minimum orbital velocity such as the moon or Mars, rail launch could be used. (A fusion reactor could be one possible power source).

In Earth atmosphere, you could, in theory, use a reactor to produce heat and convert water to steam, unfortunately this has major weight and efficiency issues (it was considered with Fission reactors in the ’60s). Designs that are currently being developed, such as Skylon would make these look big and heavy.

What would be needed is a revolutionary technology that could produce an adequate force, using only electricity or some other form of energy as a power source and no mass ejection. As far as I am aware, no one has achieved this yet.