It will be much better if Real Madrid give up the La Liga title, because it will not be easy for them if they is still ambitious with La Liga while Madrid is still struggle for the UCL title.
Real Madrid's current situation is not the same as last season when they secured two titles in one season. In addition, their rivals have also develop from last season
I also agree with what you said because this season Real Madrid must also see more realistic opportunities in terms of getting a trophy this season. For example, like the trophy at Cope Del Rey, which Real Madrid still has a chance to get and also the trophy at the UCL, as you said, so it is only natural for Real Madrid to forget about the La Liga trophy this season and give it up to their eternal rival, Barcelona.