You can cycle through Day 1: chest, shoulders, triceps; Day 2: back, biceps; Day 3: legs, as long as you can recover from it and til you need a break.
I know some people who cycled through this as long as they felt like and/or til an off day is needed. It's the split I favor, but I train two on, one off.
Session 1: chest, biceps
Session 2: legs
Session 3: shoulder, triceps
Session 4: back
As I said, I train for two days on and two days off. I can see this being done successfully for the max of all four sessions in a row because back day might affect chest-biceps day negatively if a day off is not taken in between them.
This can have someone hitting each body part once every five to six days.
By the way, bro splits work if there is enough direct frequency, as in the first example here, or with some indirect frequency, as shown in the second example.