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This is inseparable from the luck that Arsenal got in this round because they faced a much easier opponent compared to some teams who actually met fairly evenly matched opponents. That does not mean that Liverpool do not need to focus on the next match, but they have a slight advantage because they will face a much easier opponent. Especially after getting a win against PSG so Liverpool's burden will be much lighter.
Liverpool's next match will face Southampton and Everton in the Premier League so it will be a little easier for them to get full points because the opponents they face are not too strong and even Southampton itself is the weakest team in the Premier League at this time.
The first leg of the Champions League win against PSG means a lot to Liverpool and therefore they might be more comfortable facing Southampton. But I don't agree if the match against Southampton is considered easy, of course because Liverpool must do their best not to lose points in the next match. Southampton is certainly not favored, but they also have a chance to win points as long as they are able to take advantage of the opportunities available.
The good news is, Liverpool are playing at home in their next match. Liverpool are favourites to win 3 points at home againt Southampton, but they must still maintain their focus even though losing 1 match will not really put them in danger.