There are really so many ways how to use it so I am even confused with the thoughts where it is more important
I do not quite understand what you mean !? The blockchain will not be soon applied all over the world. There are many countries where there is no electricity, I'm not talking about the Internet. First you need to solve the global problems of humanity, and then apply the blockchain everywhere.
The blockchain system is still at the development stage and there is no sense at all to apply it, and even this will not be for 10 years.