Real Madrid should focus on Copa Del Rey and the Champions League. But Madrid should not be too worried about the Copa Del Rey final. I don't think the opposition Osasuna team is very strong. If Madrid's performance is stable, they can become champions of the Copa Del Rey.
If they want to win the Champions League title, Madrid will have to focus completely on the Champions League matches. Madrid had a great performance in the quarter-finals. They will likely play against Manchester City in the semi-finals. It will not be easy for Madrid to play against Guardiola's team. Moreover, Haaland is in very good form. Manchester City can't be beaten if they are not fully focused and in rhythm.
Real Madrid have two weeks left for semifinal Champion League round waiting the winner between Manchester City or Bayern Munich, seems have enough time for Madrid back focus to La Liga indeed remaining many points left from Barcelona. I don't take Osasuna lightly in Copa del Rey final but sure Real Madrid favorite for winning Copa del Rey this season and waiting for La Liga if Barcelona loss points again after inconsistent performance last two draw straight game against Girona and Getafe.
Next games, Real Madrid against Celta Vigo and Barcelona vs Atletico Madrid, have advantage for Madrid hope the rival team will loss points against Atletico Madrid and has opportunity for cut off difference points.