As we get into the beautiful Parshiot of the Book of Devarim, there is a constant repeated theme.
“These are the Mitzvot that you are to observe IN THE LAND.”
Rabbeinu Bechaye makes the point very clearly. He writes, ״עיקר עשיית המצוות בארץ״. The principle place where we observe the Mitzvot, is in Eretz Yisrael.
Many commentators felt that the main reason why Moshe Rabbeinu wanted to enter Israel was because of the numerous Mitzvot that could only be observed in the Land,
We call these, מצוות התלויות בארץ, the Mitzvot that depend on the Land. Even today when we do not have a Beit Hamikdash, there are many Mitzvot that apply only in Israel.
Simply put, the Torah intended that all Jews live in the Land. And a side benefit of living in Israel, is that we get to observe more Mitzvot here.