If you have empty slots in your club, it will drastically decrease your income - make sure you can fill all the slots. You might have to fiddle around with the upgrades to not have empty slots remaining.
I said in my devlog that I...forgot to implement Mina in the club :'D I only realized once I had published the update. I will add her in the next update though!
And yeah, you won't look in on the lessons as before. I will try to make up for it in the future, but baby steps.