Learner's definition of DIVERSIFY
to change (something) so that it has more different kinds of people or things
The country is diversifying its energy sources.
farmers who want to diversify their crops
You should diversify your investments. = Your investments should be diversified. [=you should invest your money in several different ways instead of investing it all in one thing]
to produce or sell more kinds of products
to increase the variety of goods or services produced or offered by (someone or something)
[more diversified; most diversified]