[sebnun]

Great work, I am currently building something similar.

https://www.openlang.ai (very rough MVP, please try it on desktop)

It has an AI tutor also like yours, but the main function is to learn via podcasts and YouTube using the language showing technique.

Based on my own experience learning a language, once you reach an intermediate level you usually hit a plateau, and you need to watch and listen to as much content as possible to improve.

The key is to keep your motivation high, and you do that by using content you actually care about. Learning a language shouldn't be something tedious but something you look forward to.