With the arrival of Mbappe, it is certain that a new strategy will be needed in the team. In fact, Mbappe and Bellingham can play in harmony with each other, if they are placed on the field correctly, Real Madrid will have no problems scoring goals next season. But these two players need to be compatible with each other, if they cannot achieve this, there may be some confusion 
Of course, there strategy will be different from the season 2023-2024 when there is no strong striker in the attacking line of Real Madrid. In the season 2023-2024, Vinicius and Rodrygo are 2 players in the front line of Real Madrid, they are supported by Bellingham. The formation in the last season was 4-3-1-2. In the next season, the formation will return to be 4-3-3. Mabppe will be put on the striker position, meanwhile Vinicius and Rodrygo will play as wingers. Bellingham will return to his best position (center midfielder). I guess Real Madrid will use Camavinga-Valverde-Bellingham in the midfield line, meanwhile Vinicius-Rodrygo-Mbappe for the attackers. I think this will be a good formation, there is no confusion here. All the players will play in their best positions. 