Arsenal has maintained their consistency. And they know very well that losing a point in any match will cost them a place at the top of the points table. Because Manchester City is now only 2 points behind. And so Arsenal has to continue their good performance in every match now and try their best to win.
It is true. Arsenal must maintain their good performance if they want to win EPL title this season. Man City is a strong competitor and the point gap is only 2 points. If Arsenal gets a draw or a loss, Man City will overtake him from 1st place. If it happens, the chance of winning the title will be smaller/harder. So, Arsenal players always try their best to win every match in EPL.
Since Arsenal are not playing in the Champions League, they can now fully focus on their Premier League matches. Despite performing in the Europa League, the Europa League teams are relatively weak. And so if Arsenal's key players don't get injured and they don't suddenly lose their truck then Arsenal are the favorites to win the title.
This season Europa League will have some big clubs. Ajax, Atletico Madrid, Barcelona, and Juventus will join Europa League competition because they are eliminated from UCL. Arsenal may have strong opponents in the next round, so they cannot think it will be as easy as in the group stage. If they are not serious or don't focus on this competition too, they can be eliminated in the next rounds.