As Doomloop observed, Liverpool just changed their coach, you don't expect them to continue with the momentum of Klopp. It is possible that the momentum could and if care not taken, drop low before they could rise again.
To be honest, I didn't know Arne Slot before. But that's not a problem in my opinion because I personally don't know many coaches apart from a few names that often appear in the sports media. But we can't expect Klopp to gain momentum. Liverpool have changed to a new coach and I think it will take some time before they get momentum back. I doubt Liverpool will be one of the favorites in the UCL next season. I didn't expect much from the first season with Arne Slot. It's not easy to regain momentum in your first year.