The performance of Everton's players in the FA Cup is not weak. They are performing quite well. However, the team's performance in the Premier League deteriorated somewhat. After losing three matches in a row, they managed to share the points against a strong team like Aston Villa. Everton players also played very well against Crystal Palace in the FA Cup match. Their opponent in the next match is Luton Town. I think Everton team is stronger than Luton Town. Luton Town's defense is very weak. They won't win against Everton with such a weak defense.
Luton Town could be surprising because in several matches, such as against Newcastle, they emerged victorious and even against Liverpool they managed to hold Jurgen Klopp's team to a draw. Everton lost their first meeting when they faced Luton Town at home and it is not impossible to suffer defeat again when they face Luton Town away from home. The conditions at Everton are really not good because if they fail they will leave the Premier League this season and return to playing in the second division.
It will still be a long time before the meeting between the two will take place and to be more precise in the fourth month. Everton's next match will be against Fulham, Tottenham and Manchester City. These three matches will be quite tough for Everton and I doubt they can get points because these three teams are still strong enough to beat.