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There is no luck and they are too focused on chasing the Champions League, so Real Madrid's appearance in La Liga is not fully concentrated. Entering the second half of the season, they also experienced a decline in performance and suffered several defeats which caused their points to be further away from Barcelona. This season they have good strength compared to Barcelona and there are good hopes for next season for Real Madrid.
I don't think Real Madrid is any better than Barcelona after Benzema went to the Arab Pro League. Real Madrid do not have a suitable striker next season as Asensio has also gone to Ligue 1 and joined PSG. No real striker has signed for Real Madrid to replace their best striker, but they have had a good midfielder since signing Jude Bellingham.
If you compare Real Madrid vs Barcelona, then I think Barcelona are still quite ready to win the La Liga title next season. They lost Busquets and Jordi Alba, but Barcelona still have a suitable replacement for the two senior players next season. La Liga is even more exciting when both teams have great strikers, but I think it's difficult for Real Madrid players to stop Lewandowski from top scorer without Benzema.