I am sure there are other things you can do, but I would not recommend it. Sonic Frontiers is a company that is quite painstaking over component selection (except the horrid valves they use) and you will find it very difficult to identify any sub-standard parts in their products. Even the boxes and feet they use are very good. I suspect that the best you would do is change the character of the sound, not get any huge improvements like you will have got with using decent valves and a decent power cord. This is not to say their products cannot be bettered by other products, just that their strong-point is the high quality of components and assembly.
