I hate Erik Ten Hag because of what he did at Manchester United, but I wouldn't totally blame him for Bayer Leverkusen's poor performance because when a club sells their key players without signing new players as replacements for the players they sold, that club is destined to struggle in their domestic league.
Many are unaware of what they are giving to the club. If possible, it would be great if the club's performance improved. But we know that Man United is even worse, so I think players like that lack dedication. They only want money. I feel that many Manchester United players today are like that; they don't work hard enough. They seem to lack responsibility, so their performance is unlikely to improve. Although it hasn't been officially confirmed yet, it has been mentioned that Onana will be loaned from Manchester United to Trabzonspor. Even though it's only a verbal agreement, I think it's highly likely to happen soon. Because the transfer market is currently limited to a few countries only.