Doesn’t mean “keep it boring”. Contrary to what you may think, a minimalist approach requires a lot of creativity. The use of negative space is an integral part of minimalist photography.
A well placed subject doesn’t have to be large to have a big impact. Deciding what to leave out of the frame and create a stronger image can be challenging and often requires a lot of practice until it becomes the way you see.
Minimalism is a very subjective concept in the art world!