No one tells you that they delete inactive accounts. I used to have over 300 solved problems htere. Now it is all gone, all the effort, but the skill remained of course.
(I have all my solution code, in source control no less, so if I ever lost my account, I could just run them all and re-enter the solutions.)
I kept the code that I found clever or useful, but I had a very borderline approach to archiving my stuff in general back then. I was still in high school.