Gnuplot: How can I fix this bash code to take two input files and give an output file in SVG format as a for-loop to make 30 plots?

Question

I have to make 30 plots, each having two files. File 1 = step-$iY and File 2 = step-$iX

I would also like to set the title by having a prompt ask me for the input.This is the code I have so far. I am newish at writing scripts.

Additionally, I need to change the title " 0.84 " for each plot. So I am wondering if in the code I can have a prompt that ask for my input.
Thanks in advance

#!/bin/bash

set termoption font 'Sans,22'

for f1 in ./

set border 15 front lt black linewidth 3.000 dashtype solid
set xrange [0:5.5]
set yrange[-5:0.1]
set xtic scale 0
set xtics ("O_{2}" 0.3, "O@^*_{2}" 1.3, "OOH^*" 2.3  , "O^*" 3.3, "OH^*" 4.3 ,"H_{2}O" 5.3 )
set ytics out nomirror
set xlabel "Reaction Coordinate"
set xlabel  font "{/:Bold,23}"
set ylabel "Free Energy (eV)"
set ylabel  font "{/:Bold,23}"
p "step-$iy" u 2:3 w l dt 4 lc rgb 'blue' notitle, "step-$ix" u 2:3 w l lw 3 lc rgb 'blue' title "{/:Bold 0 V}"
rep "step-$iy" u 4:5 w l dt 4 lc rgb 'red' notitle, "step-$ix" u 4:5 w l lw 3 lc rgb 'red' title "{/:Bold ***0.84*** V}"

 set output "step.svg"
}
done