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Clubs have targets every season, there's vast difference for these clubs, winning league games differentiate these clubs, we have the elite ones that have no challenge, always ready to gain position on the table and accumulating winning points, the average clubs that's having epic challenges towards oppositions. La Liga is competitive but not for Real Madrid and Barcelona, these teams owned the league, there's exceptionally no season that passes by without these clubs winning titles. Real Madrid have made the UEFA Champions League as their priority, so winning the UCL title becomes very easy for them.
To be sure, it's not as easy as you say.
Real Madrid has indeed become the king of the Champions League with many titles, but to win the Champions League title you have to try hard to overcome various challenges from teams who expect Real Madrid to fail. It's not easy to beat PSG, it's not easy to beat Bayern Munich and it's never easy to beat Manchester City and Liverpool, but at least Real Madrid managed to beat them to win the title.
Even though the Champions League title is the main priority, Real Madrid should not underestimate its competition in the domestic league. La Liga, Copa Del Rey and Super Cup are prestigious titles in Spain, so they will not ignore any challenges from there.