Harry Kane is playing for Tottenham for years and he is a famous player there, he is loyal to his team but because of the bad results he got in Tottenham, he is better to leave and find a team where he can achieve his goals.
Tottenham Hotspur's main issue is winning trophies; they will be at their best and still fail to win a single prize. Even the club's past managers, Anthonio Conte and Jose Mourinho, failed, so I can't think of any coach that is capable of saving the club because it's apparent that the problem stems from the boards and the players. I don't see any compelling reason why Tottenham Hotspur should have one of the best strikers in the English Premier League and still struggle to win a trophy. Harry Kane is the club's all-time leading scorer, and while he has not made his personal objectives public, I believe it is high time he tries a new chapter somewhere else.
The lack of trophies for Spurs feels like a curse that has lasted many years with different managers leading to them getting sacked as a result of poor performances and poor results including some of the best coaches in the game. They can only hope it becomes different with the new manager taking over from Antonio Conte but this season will be a tough one.