Have you considered digital art? This is an exciting medium with lots of room for creative exploration. Since you can produce it on relatively small and portable devices, digital art can be done anywhere, anytime, without the need for a lot of materials or physical space.
Experimentation can occur with this medium very easily with less fear of “messing something up”, which every artist feels at times. A lot of art-making has a natural progression, like priming a canvas, putting down an underpainting, and working with translucent or opaque colors. This is on some level true for digital art as well, but the order of this progression can be changed at any point. For example, you can create a painting and then erase parts of it easily or change its size. You can work in any order, at any point in time with this medium.
With digital art, there is a lot of room to explore uninhibitedly. You can be technical with this medium or expressive and free. You can quickly access any color or brush. You can reveal layers and work with photos. Digital art is a great medium for experimentation!