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.
Atlético Madrid seem to be lagging behind in this race. If they want to be champions, they have to strengthen the squad with very good transfers. The strong squad of Barcelona and Real Madrid can be defeated not only tactically, but also the strong players you will have. Simeone may be a good manager, but football is played by 11 players on the field.
I do not think that they are really looking for a championship at all. I feel like there is a good chance they just want to be at the UCL levels (top 4) and that is good enough for them. Maybe that doesn't sound realistic to you, but I do believe that it would be the case for them this year.
When Real Madrid is the latest UCL winner and when Barcelona spent the most money in Europe, you can't really build a team that will rival those teams, how could you. Plus they do not even have the call for it, like Lewandowski wanted to be in Barcelona, nobody really wants to be in ATM, they just end up there if they can't play in bigger clubs hence why it's harder.