I hope to not see the kind of performance they had against Qarabag this time in short. They can't beat West Ham that easy by playing inconsistently. West Ham aren't an easy team to beat as we are talking about a Premier League quality.

I think Leverkusen will win the first leg and maybe a finish with a draw in the rematch.
Yes, that's right, because this is a quarter-final match, of course Leverkusen should be able to play more seriously because against Qarabağ previously they seemed to have a bit of difficulty, especially against West Ham, who are in the EPL class, which is certainly much more complicated than Qarabağ, we also need to know that it seems that Xabi Alonso also wants to maintain the performance of its players so that they remain in good condition to be able to continue to maintain their unbeaten record during this season in the Bundesliga. I think it is difficult for Xabi to rotate players for matches in the domestic league and UEL.
Against West Ham there might be a little difficulty but Leverkusen should be far superior in terms of play, it seems that this match will be the highlight of many eyes where everyone sees how Xabi Alonso brings Leverkusen to a more difficult level in a big league like the UEL and not only in only the domestic league, especially if this season they win their challenge will clearly be different, namely entering the UCL next season to compete with other European clubs which might be a new challenge for Leverkusen next season. Leverkusen must be able to win this first leg so they can advance to the next round when they draw in the second leg.