Therefore, in my opinion, fourth place in the Premier League this season will most likely go to Aston Villa. Because if you look at the remaining match schedule that Tottenham will play, as said by @Bitcoin Hunt3r it is likely that there are only 2 matches that Tottenham can definitely win. And of course, with these 2 wins, Tottenham will not be able to beat Aston Villa in terms of points, especially if Aston Villa is able to win the match against Crystal Palace.
With latest bad matches and results of Tottenham Hotspur and very few match days left in Premier League, the fourth position can be considered as unreachable for Tottenham in this season. Again they will miss Champions League and it is a very disappointed ending for them in this season.
It is more disapponted because they began this season very well and impressive but fell down too bad in latest weeks of season. With departure of Klopp in Liverpool, Tottenham can compete directly with Liverpool next season for top four. At least they will have one "weaker" competitor in top four competition.
Yes, last season Tottenham failed to get tickets to the Champions League, because their performance was much worse than this season. The reason is, last season Tottenham was only able to finish in 8th place in the Premier League. However, this season there is a big possibility that Tottenham can finish in 5th position. So even though it is not significant, Tottenham's performance this season has improved quite well. Maybe if, for example, Tottenham can maintain their performance better this season, maybe they can get tickets to the Champions League. But that's okay, because by finishing in 5th position, Tottenham can take part in the European League. This is better than not participating in any competition next season.
And for next season, even though Liverpool will no longer be coached by Klopp, it is likely that their performance will not be much different from now. So, if for example Tottenham do not improve their performance, next season Tottenham will definitely still have difficulty competing for the top 4 positions in the Premier League. The reason is, let alone competing with Liverpool, even competing with Aston Villa, Tottenham are having a little difficulty this season. So if you say Liverpool's performance next season will be a little weak, I don't think that's true.