Light is made of photons, which are easiest to lift if you are made of mirrors. However, a beam of light is much more gratifying to lift if it is traveling through a liftable substrate, such as a tube of water vapor, or a flourescent bulb, and emitted by a light source also within the liftable substrate.

How To Stand On A Cloud

This is probably best done by placing an air vessel over the cloud such that your feet are near the top.

But it may also be possible to make a very large lightweight mesh that would be held up by clinging to billions of water particles.

Maybe such a huge mesh could also generate electricity from ions in the atmosphere and send it to the ground.

I only have a high school education in physics so I don't really know what I'm talking about.