Gnuplot - Labels cut off plot - bash

Question

My x and y labels are cut off the pic
I found the crop/nocrop option but didn't work.
How can I set a margin? and as you can see the titles (top right) are covered by the data. How can I set a margin there?
The following code comes from my bash script.
#set output
set terminal png large size 1920,1080 enhance background rgb '$BKGD_COLOR'
set output '$PLOT_OUTPUT_DIR/BW_${ArrayFile[$j]}_$DATE.png'
#set data
set datafile separator ","
set timefmt '%d/%m/%Y %H:%M:%S'
set xdata time
set format x "%d/%m/%Y\n%H:%M:%S"
#set axis (new style named 11, disable top and right axis, disable tics on top and right)
set style line 11 linecolor rgb '$TEXT_COLOR' linetype 1
set border 3 back linestyle 11
set tics nomirror font "/usr/share/fonts/dejavu/DejaVuSans-Bold.ttf,16" textcolor rgb "$TEXT_COLOR"
#set grid
set style line 12 linecolor rgb '$TEXT_COLOR' linetype 0 linewidth 1
set grid back ls 12
#set line style
set style line 1 lc rgb '$RCVD_COLOR' pt 1 ps 1 lt 1 lw 2
set style line 2 lc rgb '$SENT_COLOR' pt 6 ps 1 lt 1 lw 2
#set text
set key font "/usr/share/fonts/dejavu/DejaVuSans-Bold.ttf,10" textcolor rgb "$TEXT_COLOR"
set title 'Bandwidth (Mbps)' font "/usr/share/fonts/dejavu/DejaVuSans-Bold.ttf,14" textcolor rgb '$TEXT_COLOR'
#Removed - set ylabel 'Mbps' textcolor rgb '$TEXT_COLOR'
set yrange [0:*]
#plot using the column 1 and 3 of the CSV file. with line points and title 'Bytes Received' and line style 1 (as defined above)
plot '$DIR/ResultsCSV/mg_bandwidth/${ArrayFile[$j]}.csv' u 1:3 w lp ls 1 t 'Bytes Received', '$DIR/ResultsCSV/mg_bandwidth/${ArrayFile[$j]}.csv' u 1:4 w lp ls 2 t 'Bytes Sent'

Answer 1

Set the font-size of your tics when setting the terminal. This size is used to determine the automatic margins:
set terminal png ... font ',16'
Alternatively you can set explicit margins with
set lmargin screen 0.05
set bmargin ...
For possible coordinate types, see e.g. https://stackoverflow.com/a/23180595/2604213
BTW: Use the pngcairo terminal which has a much better rendering quality.

Answer 2

#Christoph provided the answer about the margin, but you asked about your key as well.
In order to fix that, you can put the key in a different position. Doing
set key inside top left
will move the key to the left side, where the data won't cover it up. You can also move it ouside the plot altogether with
set key outside top right
which will move it to the right side and outside of the plot where it won't be covered up.
See help set key for more detail.