Borrussia Dortmund are really known for being business minded and selling their best players to bigger clubs to improve their self financially. Despite selling their players they still always perform well and they have good scouting staffs that always scout talented players for them. Dortmund always fight for titles because if they don’t they wouldn’t have challenged Bayern the season before this this one that just ended, they almost won the title but it was unfortunate that they lost the title in the final game of the season and this season they were still able to make it to the Champions League final and they lost again. It’s just that luck has not been on their side lately but i know they always work hard to win titles.
Real Madrid were just more experienced in such stages of the competition but Dortmund gave them a strong fight.
They're obviously one of the best when it comes to buying young players and making good fortune from them whenever they're sold outta the club. I can mention countless players who they brought in for a lesser figure, a good example to mention recently who left the club would be Jude Bellingham. ( As he was brought in for a lesser fee, same goes to Jadon Sancho before his big money move to Manchester United )
What titles would that be? Lol. They are no different from Arsenal. I consider them bottlers because they could have done better so they could win the German Bundesliga League Competition that same season. It's nothing about luck, they just don't have the character, not even the capability, more to add would be experience.
I think it is still quite early to conclude that a team's performance is in a worse direction because the team you mentioned could make a breakthrough again next season, although I am also not sure that Borussia Dortmund will reach the Champions League final again. However, we also have to understand that it is not impossible for Borussia Dortmund to repeat this as long as they have the ability and a much higher level of luck next season. Because last season, few people predicted that Borussia Dortmund would reach the Champions League final, but in reality they could get there.
What breakthrough would that be? Well, I will wish them well next season ( Godspeed ). In my own opinion, they should focus on winning the Bundesliga League Competition first.
Let's see what they can do, for the Champions League Competition next season, I'm expecting more from the Seria A Italian clubs, I would love to see a change, I don't like how La Liga and English Premier League Clubs have dominated the Champions League Competition alone.