It is true that rich people in creating their wealth with long-term investments, because they think it will be easier to run it and efficient in time and that is its advantage, then the process is considered easier for those who are experienced, with this strategy rich people will judge it better by investing in various types of assets in the value of more profits obtained, which of course with careful planning.
Various types of assets eventually get cleaned up into a set of handful assets. Too much diversification leads to problems as well.
It should be kept in mind that some assets will do well in short period of time. The buying time for each asset is different and then if done correctly, the buy low sell high on any asset class yields the maximum profit with minimum stress.
That is how investments lead to creation of more wealth.