Firmino performs a crucial function for the front three in pulling defenders all over the place, and creating space for Mane and Salah with his wonderful off-ball movement.
When he's forced to drop so deep, Mane and Salah are essentially isolated.
We need a midfield change to turn this around.
This line up has served us well for a very long time, but Klopp needs to let this squad develop some versatility as well. Keita and Ox are finding some form, and offer an alternative brand of football. Start trusting them.