I've said it before.
Cancelo LB, Balde RB, both cuting inside with wingers keeping width (they can't do anything else effective anyway) could be worth a try.
I think we would defend better that way. Most chances created against us are through the middle as there aren't really elite wingers in La Liga besides Vini and we have Araujo covering him in El Clasicos.
Cancelo played arguably his best game for us at LB and Balde did well when played on the right last season. Don't say this would 100% work but just something I think could be worth trying in some games. Could also use Cancelo as inverted FB and Balde to keep width.
I just don't think utilising them the way we currently are gets the best out of either.