First, Spanish is the third most spoken language in the world, used by 500 million people, after Mandarin Chinese and English. In addition, 25 nations speak Spanish as an official language or as their main language.
Then, many languages have Latin origins, including French and Spanish. You will have a lot of ease to learn Spanish. Many words are similar, and the grammar is very similar too.
Moreover, learning Spanish will make it easier to learn other Latin languages such as Italian for example. It may even help you to understand Russian and German, since these languages also have Indo-European roots and also have characteristics present in Spanish.
In addition, by learning Spanish, you will discover a new culture totally different from yours.
Finally, thanks to Spanish, you will be able to travel everywhere in Latin America and Spain and your interlocutors will understand you.
I encourage you to learn Spanish.