I agree with you that Tottenham can’t really win any major trophy right now, and winning the Europa league is really a great achievement, but don’t you see the position which Tottenham ended the season on the premier league table? They ended the season in 17th position, that’s really terrible, they can win the Europa league title, and still end the season in a better position.
Tottenham were just lucky to avoid relegation, just imagine how embarrassing and shameful it’s going to be for a team like Tottenham to be relegated, if Tottenham management doesn’t make changes in the team, then I don’t think they will be able to achieve anything by next season, and might still end the season at the bottom of the table.
I don't think Ange Postecoglou is to blame for his team Premier League finish last season. They ended 17th and won the Europa League, which was an important win for the manager, who usually wins things in his second season. Tottenham has a great squad they can depend on next season, but their players are regularly injured. Tottenham had a lot of injured players last season, yet Ange managed to win a trophy despite that most of their key players missed the final due to injury.
However, there is a rumor that Tottenham is in talks to sign Thomas Frank, who managed Brentford last season. I'm not too familiar with Thomas Frank coaching career, but I believe that he did a great job at Brentford last season, beating some of the top clubs and finishing 10th in the league, but we're not sure if this manager has what it takes to coach Tottenham in the next Champions League.