I very much agree with you. And Real Madrid still needs a lot of improvement, especially in their back line which looks very fragile and has many gaps. In that match, Real Madrid almost couldn't win. Even though the difference in strength between Leganes and Real Madrid should be very large. But in this match we saw that Leganes' strength level could still match Real Madrid's strength.
And unlike Real Madrid, we see that Atletico Madrid can win easily and with a very big score, namely 5-0. I hope Real Madrid can improve their weaknesses before the UCL match.
Real Madrid have improvements and they are now better than themselves in early months of this season, with poor performances of Mbappe and many injured players. They now are leading La Liga and already went to Champions League playoff phase, and things are good for them than early months of season when they fell behind Barcelona with big point difference.
They of course don't win any title in February but they are going well and if they can play well or better, La Liga title will belong to them. In Champions League, two playoff matches with Manchester City will be very difficult, but if Real Madrid can beat this opponet, at later phases Real Madrid will be a dangerous opponents for any big club in Europe.