Today, many people halt on the brink of success and riches, fearing others they know only by hearsay, reported to be taller, better, more talented and deserving than they. It is not reality that stops your success, so much as your giant fears. Though a new generation crossed the Jordan, it would be centuries more before God's people came into effective possession of the land that was theirs already, by contract. Once David toppled Goliath, his people found no problem killing off any others lurking in the land. The example of the first successful person is always soon acted on by others who hesitate until then.
Success breeds success by giving example and permission.
No one can be forced to be successful. Despite miracles, the Israelites did not see themselves successful, so they never were. What they felt inside overrode what they saw God doing outside. A taste for the past killed their foretaste of a better future. The successful are always people of the future.