Well as you all know almost everyone on here and I see in the gym does bodypart splits. Yes it is very sad for me to say this, but its the truth. If you have been doing what everyone in society does give it a rest and try something new. Maybe something like this.

Day 1: Whole lower body
Day 2: Whole upper body
Day 3: Off
Day 4: Whole lower body
Day 5: Off
Day 6: Whole upper body
Day 7: Off

or

Day 1: Whole lower body
Day 2: Upper body horizontal push and pull
Day 3: Off
Day 4: Whole lower body
Day 5: Off
Day 6: Upper body vertical push and pull
Day 7: Off

Personally I like push/pull antagonist muscle groups ie. bench paired with row ect. I feel that I get a better pump doing it that way. There are some great benefits doing higher frequency versus a body part once a week. I can think probably 10 off the top of my head, but I'm not gonna sit here and try to promote changing your split. I'm just trying to encourage everyone to try something new once and a while.