There are 3 length and 1 Time dimensions only.
FTOE
We can ignore other dimensions for our convenience but in reality there are 3 and 3 only length Ds and 1 time D. That's all, there is to it.
As there are only 3Ds, the 4thD can't be plotted. Time is an imaginary D. Imaginary in a sense, it has no physical existence. It is change... Time=Change. It can't be touched or eaten or smelled or felt or what ever... It does exist, it's change. We can plot a line - 1D, a 2D graph and a 3D graph but not more than 3D. You can't plot what can't exist.