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.
The quality of Atletico Madrid will not decrease even though they are not very active in the transfer market, Simeone really believes in the ability of the squad he has. Atletico Madrid is still able to provide competition to Real Madrid, Barcelona and Sevilla at the top. While in the hands of Simeone, Atletico Madrid have always been a team that is able to provide competition in the top four standings and some of them have won the La Liga trophy while breaking the dominance of Real Madrid and Barcelona as the rulers of La Liga.