If I setup a $10b trust fund to buy up Texan land, I can't unilaterally invade Texas and build my ethnostate on it after I've purchased, say, 6-7% of it. That's the percentage of Palestine the Zionists bought before expelling the indigenous people in the Nakba genocide.
Likewise, if you legally purchase double-digit percentages of Indian, Chinese, Brit, Australian land, it doesn't give you the moral or legal precedent to expel the natives from the rest of their land and declare it your state.
You can evict renters from the land and move in yourself.
If they then take to violence against you, you have the right to defend yourself.