Have you tried more traditional textbooks? I understand there's a desire for an easy-to-use interactive app, but I've never come across anything remotely as good as a textbook like Minna no Nihongo (I used this book 20 years ago when I started learning Japanese - maybe I'm biased?).

You can see sample pages here: https://omgjapan.com/products/minna-no-nihongo-shokyu-1-hons...

It is 100% in Japanese, but it has a companion book with translated grammar notes if needed. The majority of the book is excellent content in the form of dialogs and readings designed for beginners. I suppose the exercises work better in a classroom setting...