Although the victory will not put pressure on Bayern Munich at the top of the standings, this victory is very important for Leverkusen as you said in order to raise the team's confidence to face the next match. Moreover, they still have hope to win one trophy this season, namely the DFB Cup which is currently in the semifinals against Arminia Bielefeld.
For the opportunities that are still available, Leverkusen can take advantage of them because talking about the Bundesliga title is a little more difficult. The opponents they face in the DFB semifinals are also not too strong so that Leverkusen's chances of winning the match are much greater so that they can ensure they reach the final for the competition.
Leverkusen is not as strong as last season because they have failed to compete with Bayern Munich who are increasingly solid so that next season there needs to be changes made by Leverkusen so that they can compete again for the Bundesliga title.