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As it has been answered in your other post https://community.adobe.com/t5/indesign-discussions/the-only-style-of-text-in-indesign-is-that-it-is... either use styles or the script SJRiegel told you about.
You can also run a find change like this
Note that by default, InDesign will try to find the regular style, so you have to remove this information and that will only work if the font you want to change has exactly the same styles than the new one (regular, bold, and so on).
You can also use the find font feature:
How I do: I build my style system up from a root style p, all other styles are children of that style or grandchildren. If I change the font family, all others styles will change upon the point where those styles were changed by themseves.
Another way to go is Type > Find Fonds
Here you can change each font appearing and change to another font and style and redefine the styles.