Liverpool's problem is that they are starting the second season very poorly and these feats at the end of the season are not what is expected from a team of fans. This time, feats will probably not help them, the gap from the leaders is very large. Arsenal are unexpectedly at the top of the league and have everything to try to keep their lead, although Jesus' injury could be a problem. City are not playing as confidently as they used to be, this is so good for Arsenal.
It's a little strange about your last statement, Manchester City is in fact still the dominating team in the Premier League even if they are 5 points away from Arsenal. You don't need to be too sure about Arsenal because maybe it will disappoint you in the end, but if you are an Arsenal fan then just enjoy this great time and hope they continue to win games and keep up the form.