A friend and I became unofficial TAs for a high school computers class when we defeated the remote-viewing software and any web blockers, we knew more than the poor teacher and it was easier to let us do what we wanted if we promised to help other kids do the actual lessons.
That network had terrible security. So many important files stored as unprotected text in the intranet.
If I was going to erase myself by changing history I’d dream a lot bigger. Constantine I is the oldest definitely-real name that put big things in motion. Would Rome have adopted Christianity anyway? Maybe.
Sinking old Chris Colombus’ famous voyage would save an awful lot of lives too, and at the very least postpone the various genocides white people committed in the Americas. I think it would be important to let him get going so that everyone used hia failure to reinforce their reservations about sailing West.