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Authors can do great things with just a pen and some paper.
We create stuff, solve problems, inform, inspire... Make people smile and laugh or sigh.
Lots of great things get written while the author is located in the most unusual places. Many books, stories, chronicles, have been penned under the harshest conditions... in jail, for instance, or during wars or while recovering or dying in hospital beds.
Learn to write well and you can and will change the world!
How much of the world you wish to write for is up to you.
Heck, Shakespeare still influences the present-day world, hundreds of years after his death and the Play-Write will go on influencing coming generations yet to be born too.
Will someone find your book four hundred years from today and be delighted?
If you write it passionately, they will read it cover to cover.