I think that chelsea must try to stop wasting more money for nothing yet so many problems are still happening in the club. Chelsea shall try to learn from arsenal about how to search new players that was not only skillful but it must be also worthy with the price that already spent.
You need to make sure that you have some solid plan if you are going to spend that much money on a team but Chelsea didn't had that. All in all, they should stop spending any money at all, find a way to win something with these players, find a way to be a good team and then if they could get some achievements, they could restart on spending money again. Unfortunately for the time being they are just not doing that at all.