Dortmund will play in the UCL next season. UEFA has created a new rule format. Among them is that the number of additional tickets that will be given to the league will be calculated based on the coefficient value of a team when playing in European competitions, such as the UCL, UEL and European Confederation Cup. This value shows that this season the Bundesliga has the best coefficient value so they get 5 tickets next season. Dortmund is in fifth place in the final standings and fortunately they can play in the UCL next season.
But honestly if this rule is true, it is one of the best decisions to have been taken by UEFA because this goes to crown the efforts of the leagues based on their performance as an additional advantage. Also, if UEFA can based an automatic qualifying to any club that gets to the finals or semifinals of the UEFA Champions League, that will also make a lot of sense to what's done already.