Their situation is so similar to Sevilla now, completely true. You know how strong Sevilla were in the La Liga until the 2021/22 season. They have nearly always been a part of top 4 at the end of a season. But now they are lost and trying to find themselves again.
I hope both of Lens and Sevilla can make good progress in their domestic leagues.
Honestly, I can't say much about this team. As you said, last season Lens managed to finish in 2nd place in Ligue 1. This season, Fanck Haise's squad looks completely helpless. At the start of this competition, in the first 5 matches, Lens was unable to win even one match. although one of the matches ended in a draw. After playing a draw in the League against Sevilla, Lens seemed to have strong motivation with two wins in Ligue 1 against Toulouse and Strasbourg. after that, they surprised by overthrowing Arsenal on the second matchday with a score of 2-1.
After that, there were various positive reactions if Fanck Haise's team would return to its original track. Unfortunately, the three matches after that in two different events only resulted in draws. Don't be surprised if Lens has the potential to achieve bad results when they host Nantes this week. In fact, I'm not at all sure if Lenz has a chance of qualifying for the next phase in the Champions League group phase. However, Lens is now in 2nd place with 5 points. There is potential if Lens falls when they visit PSV's headquarters, Arsenal, and host Sevilla.
IMO, one of the things that caused this team to experience a decline and change in performance was when they released several important players in the transfer window last summer. As for the newcomers, they didn't live up to the coach's expectations. or maybe, if the system Heise implemented was not ideal with the players available. Now, Lens is in an unsafe situation. they are ranked 15th two points behind Clermont.