Real Madrid is playing very well this season and they were also able to bring in new players when they out of a sudden had to deal with injuries. Both Courtois and Vinicius Junior are key players ad while they found a great solution for Courtois, which was hard enough, it was difficult to do the same for Vinicius Junior when he was injured. But he is back and living up to his full potential. Barcelona won't get close to them, but to put it in a nutshell whether there is still a chance for the title race to become close, it will all be about matchday 32. The clasico will decide whether there is going to be some fighting until the end.
Form always determines the success of any squad. Real Madrid is in good condition this season, and there is not much doubt that they will win the La Liga, since I do not believe Barcelona will be able to compete with them. Real Madrid is already eight points ahead of Barcelona, and they defeated Barcelona in the first leg. With Real Madrid's current form and the points gap they already have, I don't think the El Clasico will determine whether Barcelona can succeed or not, but they should be able to close the gap on Madrid due to their inconsistent play.
We have seen in their past games how the results went which does seem to be what an El classico in Laliga was like between Barcelona and Real Madrid years back when players like Messi, iniesta, Xavi and the likes of them were still playing in Barcelona. Right now it's glaring that Real Madrid has hijacked the game with the level of squad they have right now which Barcelona are struggling to match up with coupled with their financial crisis.
With the points gap between Barcelona and Real Madrid an El classico come April 21st isn't going to make any difference as Real Madrid are still in a better form to beat Barcelona in that game. Where I think Barca's focus should be much on is in the UCL, that's where they can bring greater joy to their fans if they be able to lift the title buy I doubt if they will also have a chance there too.