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.