I think Everton's performance is starting to improve as we saw when they drew against Aston Villa and this shows that Everton's performance is improving and I was a little disappointed because Aston Villa failed to get 3 points.
A draw after three consecutive losses is already an improvement right? hehe. You cannot really tell after just one good game but at least they are out of the relegation zone for now. They must also show that "improvement" in their next matches so watch out if they are your favorite team. I won't be surprised if they concede 2 or 3 goals after this.
They are not in the relegation zone because of the decline in performance of the teams below them. Should those teams(Luton, Burnley, Sheff United) start to play better, Everton will be in danger of dropping to the relegation zone.
The result of Everton's next game against Fulham is full of uncertainty. Perhaps Everton can hold Fulham to a draw, or perhaps they lose together. But even though Everton is a point ahead of Luton, they still need to improve their performance, or else the relegation zone will be their landing spot in the PL table