Reddit is removing the 1000 submission/comments limit on user profiles. Profiles will soon show all submissions/comments from the day the account was created.
They just hide your submissions/comments beyond your 1000 most recent contributions from your profile. The contributions remain on the website. I've found the only method to find contributions beyond the 1000 limit was to Google it or use third party archive databases.
With the new change workarounds to find old contributions will not be needed.