When Klopp joined Liverpool, he had quite a poor first season, but he had got them playing his heavy metal football. Then they started getting those players for his system and they started to develop rapidly. They won CL and EPL and now are easily one of the best teams in Europe. They lost Mane to Bayern but have Diaz, Nunez is a bit sketchy but he's not handicapping the team, and even changing managers hasn't slowed them much.
Give Motta a season to set our style, then give him a season with the players he really wants. That doesn't mean give him a blank cheque, it could be that we upgrade some weak spots like Danilo for Skriniar or Vlahovic for David etc.
Liverpool swapping Karius for Allison had a huge impact for them, but it was a very focused move by Klopp as opposed to buying half a new team.