According to the latest reports, Kane says that he's happy at Spurs and that he's willing to sign a new contract there.
He's probably evaluating his options - there aren't many clubs that can go for him. City got Haaland, in Madrid it would be difficult to pair him with Benzema, Barcelona doesn't have enough money..
Staying looks like a decent option, Tottenham is a good club. Still - if he extends he'll basically spend his whole career there and he's an elite player that deserves to fight for trophies. He will be 29 next month and still hasn't won a single one.
In EPL, I don't think any club is willing to take him actually. City is no longer interested after Haaland. Liverpool is ok with its stars and most likely they will extend their contracts there. Chelsea? Not really especially after the actual crisis in the club. ManU has enough players. Arsenal? not really and won't happen tho.. The other clubs aren't that interesting for him and for his career.
Changing league? It will be a bad idea to switch the best league by another. In addition, top clubs there didn't show interest to contact him. Overall, staying in Spurs is his unique option since there isn't any other one.