Use Ronaldo as a pure poacher in the centro of a 433 and let the man score.
Make the rest do the physical work and assign ronaldo one task and only one: Score and make us win.
The rest should support him in any pòssible way: assisting him, pressing for him, trying to soak defenders from him, or finish plays and score when everyone is marking him in the area (Dybala im looking at you).
dasitmane