I think that this season is going to be a season that Atletico Madrid are struggling to keep up while Barcelona and Real Madrid are competing hard for the La Liga title. Because I see nearly zero change about Atletico Madrid now. It is more difficult for them unless they add really qualified players to the team. I don't think Simeone would change his tactics much either.
Atletico Madrid can still enliven the competition for the La Liga title even though Atletico Madrid did not add really quality players and Simeone did not change tactics.
But I still believe that Simeone will provide the best tactics for Atletico Madrid next season in order to compete with the two big teams (Barcelona and Real Madrid) for the title in La Liga.
Atletico Madrid has always joined the competition for the title between Barcelona and Real Madrid. But they are always under the two rival clubs. They also have the potential to overtake Real Madrid and Barcelona, it's just that for now Atletico Madrid can't be stronger than them. After all they have to do something, as Barcelona did in the transfer market this time for example.