There was a stat on motd that said that Tottenham's pressing was the 5th best in 16/17 and the 2nd best in 17/18. Last season, Tottenham were 14th and, this season, 16th.
I feel that there is a lot of laziness at the club. The drop from 17/18 to 18/19 was too big. We know that, at least Eriksen and Alderwerield wanted to leave in summer 18. This contributed to that laziness, and they still have them.
Kane now has to drop deeper, which has lowered his goalscoring tally. They now have 3 players going for free in the summer, who have probably lost interest in playing for Tottenham.
There are a lot of issues at Tottenham, outside of just the manager. I do think they need a change of manager and players to freshen things up.
Pochettino is still a great manager.