Being Bilingual or multilingual is awsome. And only people who can talk in two or more languages can feel this. But there are billions of people who can only talk or understand one language. I'm not saying they have any lacking but what I feel is learning another language can bring many opportunities to our lives, not only financially but with some other mental benefits.
There is saying that if you can learn another language, it unlocks a part of your brain. I really believe this saying. It really feels awesome to understand others what we couldn't be able to do before. It's like unlocking a whole new world. Also, we can't avoid the financial benefits. It always can make you one step ahead in career choice. Knowing a second language is always preferred by most of the companies. Learning a language is not only understand the lingual, but it's also like capturing the culture. To learn another culture we can first learn their language to make it more effective.
I'm not saying you have to learn a language if you have no need. But if you can do that just for fun or curiosity you will understand the difference in you. It can bring more brainpower, improve the capacity to memorize things, increase attention and many more. So not only the active benefits there are many passive benefits also. So you can think about it.
Learning a second language is not tough though it looks hard. If you can follow the proper manner to learn or go to an institute it's a lot easier. Nowadays parents are trying to make their kids bilingual or multilingual after knowing the benefits. So give it a try and enjoy your life differently.