Mbappe and also Vinicius in the Real Madrid front line are not easy to shift from the main place so it is not easy for Rodrygo to get regular playing minutes and indeed Rodrygo should go to another top European team to be able to play regularly and make his career much better, in terms of quality Rodrygo is quite good but the price set by Real Madrid is quite high so it is difficult for other teams who are interested in recruiting him.
Nothing is impossible, and the hope of becoming a regular in the team is every player's dream. What is needed is to continue training and be able to deliver what the coach wants when given the opportunity. Thus, Rodrygo will gradually get his chance. However, if he wants to move to another club, it is also a good option so that Rodrygo can get the chance to play as a starter. However, the problem is, as you mentioned, Real Madrid themselves set a very high price for clubs interested in signing him. Even Arsenal were reportedly interested in Rodrygo, but ultimately they abandoned their pursuit.