Atletico Madrid is indeed the main competitor between Barcelona and Real Madrid. They (Real Madrid and Barcelona) are always in the shadow of Atletico Madrid. Once they make a data error, it is not impossible that Atletico Madrid will take over their position in the standings. It's just that they are one step behind the two clubs, but their potential to bring them down is very high.
Atletico also has a good chance this season in La Liga. we know how Atletico performs in competitions like the Champions League.
when their chances are still big in La Liga I think Atletico can focus on chasing Madrid and Barca. but when the situation of Madrid and Barca is not overtaken, I believe Atletico will focus more on other competitions.
The season has just started, Real Madrid, Barcelona and Atletico still have the same chance of fighting for the title, I also don't exclude other teams, because surprises can happen unexpectedly. There is still a long way to go, there are 37 more games to play in La Liga. Each match that is passed will have a different result, at one time a big team may lose to an unseeded team. Atletico must perform well in every game in order to achieve the desired target at the end of the season.