Yeah even though we were all shocked by Liverpool defeat in the Champions League but on the other hand this will be the right moment to focus on the local league, as we know Liverpool is 90% on the right track for the title so they just need to wait for this season to end. Arsenal may be Liverpool's closest rivals but currently Arsenal are still competing in the Champions League so this will affect their performance in the Premier League that's why I say arsenal has no way to catch up with liverpool.
Yes, with Liverpool's elimination from the UCL, it will certainly make them sad. But on the other hand, there are indeed positive things that can be learned from Liverpool's defeat in the UCL. The lesson is as you said that Liverpool will definitely be able to focus more on getting the English league trophy. Because even though in reality Liverpool is currently far ahead of other teams in the English league, Liverpool will definitely be more focused now. Besides, I really didn't expect Liverpool to be eliminated in the last 16. Even though at first I thought that Liverpool would continue to be able to qualify for the next round. But maybe Liverpool can be said to be unlucky this time. Because they performed poorly in the second leg. So let's just forget about this, because in essence winning or losing is a common thing. 
In addition, in the coming week, Liverpool will face Everton. I think this match will be quite interesting for us to watch. Because even though Everton is not a team that is too favored in this match. But we need to remember that in the previous two matches Liverpool were unable to win the match when facing Everton. So with that, this match should be a proving ground for Liverpool and must be able to beat Everton. In addition, by winning this match, of course, Liverpool will be even more superior in points in the English league.