This is a basic problem that Tottenham cannot fix in recent seasons from the era of Pochettino, Conte to the current Ange Postecoglou Tottenham problems are always irreparable because at the end of the season they seem to run out of gas and cannot do much in defending the results of the match.
Even though seeing their performance at the beginning of this season Tottenham have a lot of momentum to make them more comfortable in a decent position but for now they are a little troubled by the performance problems that occur.
The results are not too good from Aston Villa, it should be used as a spirit of encouragement for them to be able to get full points to shift position to 4 but Tottenham's performance in the last 3 matches is really bad which makes them apart from failing to make a breakthrough in the top 4 at the moment if their situation continues like this it is not impossible that they will also be overtaken by Newcastle later.
Spurs are relenting when it comes to top race to retain a position for the Europa. However they can still push for excellent improvement. Tottenham can not lift major title because they're not ready. The board is not ready to fixed the club entirely, it's not all about making changes when it comes to coaches but spreading to other sectors of the club, ensuring to have backup replacement for their players and doing the ultimate targets by making potential signings, players with good vision will really help the club.
For now I feel that they will still be very troubled to try to compete especially in the Champions League but indeed for the Europa League it is still very possible for them to get it because seeing from the situation that happened in the last 4 matches it really made their mentality destroyed and at this time they will still continue to be tested with superior Manchester City in the following week so that if in the end the match next week will lose again then IMO the opportunity for the Champions League is almost certainly closed.
Spurs' problems like this have occurred in the last few seasons and this is difficult for them to fix because if you look at their performance this season and last season there are many similarities where they are very good at playing at the beginning of the season but towards the end of the season they always experience problems that are not too unexpected.