I think there's a combination of things affecting our form.
Players out of form. The obvious names, Chilwell, Tielemans, Barnes. We're a young side and this will happen..
Bad luck, the ball isn't breaking for us. Some unfortunate deflections, off-sides etc. It happens when you're out of form.
To some extent we've been found out, teams are pressing our midfield and negating our strengths.
We've not really resolved our lack of goals from our wide attackers.
We've tried different formations with mixed success. The diamond worked well away at Villa but lacks width. I think Rodgers likes the 3 at the back, it sort of solves the lack of effective wide attackers by having just the wing backs providing width, but allowing for a second striker (benefiting Perez and Iheanacho), and still 3 in midfield. Unfortunately this was undone with Chilwell's poor form in midweek against Villa where he couldn't hold any width, making defending easier for Villa. I'd be tempted to play Justin instead of Chilwell.
If a formation change won't work then the signing of a class player, a goal scoring winger, i think would give us that spark, freshen up the team. I guess it just depends who's available and obtainable?