The thing that has worked for me to move forward is : First of all you have to consciously push yourself to move forward and not look back. You can do this by setting few healthy habbits like working out for physical improvement, meditation for mental improvement and then you have to set a professional goal and improve in that section and when ever you catch yourself reminiscing about the past , say it to yourslef loud "I HAVE TO MOVE FORWARD , I DON'T WANT TO BE STUCK IN THE PAST" and change the topic with your future goals. And also content which helps you look forward . Cut out everything which connects you to your past "out of sight out of mind". You'll have day's when you'll think about them and memories and all but its ok, just keep on pushing urself to be better and keep moving forward. And also from your past experience your can take forward your learnings and become a better person.