It seems like you don’t have any watched items in your history. Are you using a third-party app/integration/media center to get data into Trakt? OR do you use the website or one of the official apps?
If you’re used to v2:
- history: https://trakt.tv/users/taucher/history
- library: https://trakt.tv/users/taucher/library
You’d have to either use the Public API to do this or manage a List yourself. There are limits and a draft of a fair use policy here.