how to plot a figure containing multiple curves for the same parameter with different values?

If I have a model equation containing ,for example, 4 parameters and I want to plot 4 figures each one for each parameter with time such that each figure contains multiple curves represent multiple values for the parameter while fixed values for the other three parameters.

For example If the four parameters are x,y,z and s. And the baseline values for the parameters are (x0,y0,z0 and s0) and I want to plot four figures, the 1st figure represents the relation between different values for the 1st parameter (x0,x1,x2,x3,...) with time (x0 & t), (x1 & t), (x2 & t), ...etc., while the other parameters have the baseline values (y0,z0 and s0), and 2nd figure represents the relation between different values for the 2nd parameter (y0,y1,y2,y3,...) with time, while the other parameters have the baseline values (x0,z0 and s0), and so on.

My model equation code is attached.

[Esraa Abdelkhaleq]

This is the model code.