With the present team, Atletico Madrid lacks capacity to win the UCL. Atletico madrid made it to final at 15/16, really lucky. So in essence, all things considered, it makes little difference how much atletico madrid improves; uninspiring strategy and gameplay by Simeone will prevent them from winning UCL.
I think it's true that if Simeone doesn't train Atletico Madrid, is it possible that Atletico Madrid will experience changes, whereas what Atletico Madrid has shown so far is boring in terms of strategy, which is always the same and doesn't change every season, even though they often replace several new players in the main squad. That's why there are still many questions about whether Atletico Madrid can do without Simeone, even though so far they remain a difficult team even though they rarely win competitions.
If Simeone changes his playing style every season, it is likely that this team will look more interesting to watch this team compete, but so far what I have seen is not much different from before, what is due to poor financial support and players that make Atletico Madrid is a team that doesn't have a clear vision and mission in winning titles in every competition in several seasons or indeed Simeone doesn't instill a winning mentality in all his players so they often experience failure when playing in important matches so they don't have the confidence to win titles and win. in matches, for example the final match in determining the champion, they often fail.