Currently Bayern clearly have a great chance to continue to improve their performance, especially after they managed to beat Leipzig, which in the last few matches they have always failed to conquer, of course this provides a good impetus for Bayern at the moment, especially since they also have to do that because apart from their position is less comfortable in terms of competition now they also have to continue to collect mentally so that in the second leg later in the Champions League they can reverse the score over Lazio.
The domestic league is very different from the Champions League so not everything has to be seen in the results in the domestic league for a club to be successful in the Champions League. Bayern Munich and PSG, for example, these two teams quite dominate their respective leagues, but when they are in the Champions League they lose their best playing form. However, compared to PSG, Bayern Munich are much better in this competition because they were one of the teams that managed to win the Champions League.
As I said earlier that you cut where matches in domestic competitions will indeed not have too much impact in terms of results in the Champions League but in the end with wins and positive results obtained of course it will make a difference because they become more motivated to be able to improve even more and of course the hope is that their performance in domestic competitions will be carried over in the bigger competition (in this case the Champions League).
From the last few seasons Bayern's performance in the Champions League is not very good because they have always been eliminated in the quarter-finals for the last 2 seasons especially now they are behind on aggregate over Lazio, but that also does not mean they cannot qualify again this season because their chances are still very much there, it's just that this is a little troublesome where Tuchel is still unable to maximize Bayern's strength with the scheme he provides so this makes a difference where even a big chance in the end will not be able to make a difference between this season and previous seasons.