Agree with many points here.
Origi, IMHO, just doesn't do enough. He's much more effective with other pacy players running into space, distributing the ball quickly. He's the kind of striker that is good when there's a bit of disarray in the box. He's a decent finisher. Against organised teams he doesn't really work defenders over, make particularly clever runs or bring others into the game.
I think we'd be better with Firmino playing central, Coutinho out on the left and then examining who we could play on the right. Maybe this is Woodburn, maybe it is someone else. Perhaps Moreno should get a run at LB and we bring Milner higher up the pitch.
We don't have a lot of depth so there are few options to be honest. There's a distinct lack of pace and creativity in our front 3 with Mane out.