Arne Slot only concern going forward might be the problem of player injuries, in that case Arne Slot has to be smart enough to work around his rotation options. Fatigue will be the main challenge if Liverpool are ambitious to achieve success in all competitions, but I think Arne Slot and all his players are very ready to face it. No one expected Arne Slot to be able to manage Liverpool into a title contender team in various competitions in a short time.
His impact on the club has been very tremendous in a very short time, I thought after klopp left that Liverpool will pass through some hard times as other clubs have been facing since their long term coach left them but that didn't happen for Liverpool instead it looked like Klopp was the one holding the players back as after he left, Mo Salah came back to his old form of scoring lots of goals and Liverpool has been playing better since then. Liverpool are now favourite to win the premier League that they couldn't do for one than one time when Klopp was managing them but under Arne Slot, they're now favourite to win the champions league too in the same season.