I am a Real Madrid fan realistically, but I think it's over. No way, Barcelona is going to drop 10 or more points in the remaining 10 matches while Real Madrid wins all the remaining matches. Not even in my wildest fantasies. The only thing Real Madrid is probably trying to do is cement their place in second position, since Atlético Madrid is not so far away in the third place. If they win their match, they will be just 2 points behind Real Madrid.
Barcelona won't miss the only competition they are competing for, so it's impossible for Real Madrid to win La Liga this season, and Ancelotti knows that, therefore, he started the match with a lot of changes on the lineup, even though they have a great advantage over Chelsea in the leg 2 match. However, Real Madrid's main focus is the champions league now, and La Liga matches will be training sessions for them in preparation for it. However, the real competition will start in the semi-final, which looks to be against Manchester City, so all players should be in full physiological readiness before that.
On the other hand, Cadiz kept their position near the relegation zone, so they are required to do their best in the remaining matches, considering that this loss was expected for them.