Clubs is an option that can motivate learners to progress more. It is a clue in mobile version. The problem is there are just a few ways to interact with the members, you can control the members expelling them if you think that some are not competitive enough and accept others, I don't know if the same can become members again, but it would be desirable to announce a contest and give members a reward of good practice. More ways to interact motivating positively are desirable. Some standard contest could be chosen too and more words to introduce and advertise a club is also desirable.
An option that doesn't exist in web version.
But I love Clubs. I would like to be able to participate in more.