Like I said, the shininess depends on the Roughness.
Looking at the Colorramp you use for the Roughness, that is very light, meaning that your Roughness will be quite high and therefor the material not very shiny.
Remember that black is equivalent to 0, when plugged into a grey socket (that takes a Value as input), and white means 1.
A roughness of 0 together with a metallic value of 1 gives a perfectly polished metal; with mirror-like reflections.
Play around wit the Roughness and Metal values and look at the results.
With time you will get a feel for what those values should be to get the result you want.
