Obviously, it will be quite better for him to leave Madrid and join another suitable club, because with the presence of these trios, Neymar, Vinicius and Rodrigo in the front line of the Madrid team , he will definitely get overshadowed by the performance of these three incredible players and would hard see match to play, However it is an individual choice to make as well Real Madrid decision to keep in the club.
Yes, actually, that could be a second option for him if he wants to join another club, then he will get more playing minutes than at Real Madrid. He only plays when Real Madrid needs him when he finds a deadlock, especially with Mbappe, Vinicius Jr. , Rodrygo and Jude Bellingham will definitely feel unused by the coach because these players will definitely be Real Madrid's main squad in crucial matches, but there is nothing wrong if Real Madrid wants to make this player permanent at least to play as a second line striker so they can protect the risk injury to a major player if he plays a lot of matches.
This is a difficult decision for Real Madrid. On the one hand, Real Madrid doesn't really need a player like Juselu because they already have a fairly capable composition of players and Juselu actually doesn't meet the standards, but Real Madrid's success in winning the Champions League title this season is also due to Juselu's skill in creating opportunities in the semifinals meant that he managed to bring the Whites to the final and actually Real Madrid didn't want to be seen as a club that doesn't know itself because after tasting the sweetness of the title, it threw away player who had contributed, but on the one hand, it must have just sat there on the bench because the coach might not use him much so it would be quite a waste if Madrid bought this player if he wasn't used.