Real Madrid have already managed to create a points difference with the other teams and they are quite confident in La Liga so it is unlikely that Barcelona will overtake Real Madrid and secure the top position in the points table. La Liga has always been a rivalry between Real Madrid and Barcelona and in the last few seasons Real Madrid has done better than Barcelona but this season Atlético Madrid is able to perform well. Since the performance of Real Madrid is gradually improving, I think that Real Madrid will perform better in the upcoming matches in La Liga.
If Real Madrid perform well, Barcelona will have to fight for the second position in the points table. Since Real Madrid now has more points than Barcelona, Real Madrid will definitely not want to reduce this point gap, but they will want to increase this point gap by performing better in the upcoming matches.
In La Liga, Real changed everything very quickly, a few rounds ago Atletico was leading the table, and now Real is ahead of them by 4 points, the advantage over Barcelona is even greater. And as for Real, this is Ancelotti's tactics, they enter the beginning of the season with difficulty, but closer to the middle they get into good shape and this becomes noticeable, towards the end of the season they reach their peak form. I say this because they most likely will not allow anyone to displace them from the first place in La Liga.
I don't think Real Madrid will easily fall from the top. They have achieved a very good form in the Spanish league. Atletico Madrid and Barcelona have lost a lot of points and Real Madrid is the most advantageous team at the moment. I don't think they will lose points to small teams like Barcelona. Barcelona has fallen far short of expectations by losing points to small teams. The expectation from them was to be five points ahead of Real Madrid until now. However, they are currently behind Real Madrid, let alone ahead.