#!/bin/bash

PIDFILE=/var/run/redbot.pid

case $1 in
   start)
       echo $! > ${PIDFILE} 
       cd "$(dirname "$0")"
       su - redbot -c "cd /home/redbot/Red-DiscordBot && python3.5 ./red.py &"
       read -rsp $'Press enter to continue...\n'
   ;;
   stop)
      kill `cat ${PIDFILE}`
      rm ${PIDFILE}
   ;;
   *)
      echo "usage: redbot {start|stop}" ;;
esac
exit 0

Monit conf.d file

check process redbot with pidfile /var/run/redbot.pid
   start = "/home/redbot/Red-DiscordBot/start_red.sh start"
   stop = "/home/redbot/Red-DiscordBot/start_red.sh stop"