Feature suggestion: to have a "random lesson" button
Before the update, I used to use the "practice" button to refill the "strength" of my skills. It was useful for me to practice German in all skills at the same time. I used the "strength" bar to check my progress, and when everything was "gold" I just started to learn new skills
Now that we have crowns, the "practice" button leads to nothing => It's random and you have no visual thing to show you if you recently learnt a specific skill or not.
One interesting thing would be to have a similar button but instead of "practice" it would be "learn a random skill" and it would push you into one of the lessons you didn't do yet. This way, if you don't want to focus on a particular skill, you can just do it randomly