According to Ethnologies, French boasts of 76,9 million native speakers, which makes it the language with the most native speakers of the continent. It is also the second most spoken language in Europe. French is the official language in Paris,, the Principality of Liechtenstein, Luxembourg and Switzerland. This is, without the shadow of a doubt, a great reason for at least considering whether it’s a mistake to not learn the French language.
For many centuries, French was considered a lingua franca (a language that is adopted as a common language between speakers whose native languages are different) in Europe. Currently, French still serves this purpose, as it bridges Central and Eastern Europe.
Furthermore, because French is part of the group of France languages. That means that memorizing French vocabulary will be easier because you can relate them to similar vocabulary.