Over the past 20 years, not a single Champions League title has gone to a small or even medium-sized club. Only the top teams took part in the division: only 9 clubs received 20 titles. If we take away Real, the situation would look more diversified, but still, the last time a small club took the title was 21 years ago and it was Porto. Therefore, if you look at the situation objectively, in each season it is easy to assume that one of the top will take the title, and given the fact that some clubs are in crisis, for example Barcelona, the choice becomes even smaller.
Champions league is not for clubs that are trying to put themselves together, it is for the strongest club at that moment and that is why it is impossible for an average club to win it when there are strong clubs in the competition. There is nothing like luck because the farther you go the tougher it becomes.
Real Madrid is only interested in Champions league and that is why you see that is their main focus and they know the right strategy in which they can use to win it most times. This is the reason why they always go for the best players a d coaches so that their chance of winning it will be higher than other clubs.
Many other clubs are just as focused on the Champions League as Real, but history has turned out so that Real is the triumphant one. As for the situation in which the strongest group of clubs is very small, this is due to outdated UEFA policies. I think that if the Super League worked (I hope this project will be implemented), then for all participants there would be a minimum and maximum budget, a salary ceiling and other measures to equalize the competition. Such a league would be more interesting and competitive than the Champions League that exists now.