Realizing possible academic misconduct after degree award
What you should do, is precisely nothing. Take a deep breath. Have a culturally appropriate beverage and celebrate your finishing.
We are human. None of us is perfect. We fall. We get up. We move on. The past is past. Most of us here would probably not like to see a complete rerunning of our past selves in every respect.
But, since it bothers your conscience, vow to do better in the future so you have less to be worried about.