There's a reason why I added the last sentence, because there is a fair bit of work involved but it could be very rewarding because you can get good monetization with ads or affiliate offers.
Work includes uploading videos regularly, you can't make this work with a handful of them. A few every week, and consistent uploads will get you the views because the YouTube algorithm likes regular uploads and pushes them to the top. Besides the usual SEO, likes etc.
As a big fan of sound videos I can tell you this - even with so many videos demand exceeds supply. Let me give you a small example. I like listening to various types of sounds while working, a different one each day, and I came across coffee shop sounds. You can try this yourself but when it comes to long videos of coffee shop sounds, there aren't too many and I know a lot of others also like them too.
You can look for Adam Payne's products, although old still work, and newer ones though I can't remember any off the cuff.
By the way, this isn't Zam boni's unique idea, there are plenty of videos that teach the same thing, though maybe not the part that is missing like views.
Here's another detailed video that teaches Clickbank affiliate marketing, a technique I know works really well, and although he uses Vidnami you can get free tools to do the same thing.
Code:
https://youtu.be/e7qLUW3wjBY
You don't have to use Clickbank, any affiliate product or platform will do, and you can easily find less competitive keywords to rank for. But like I said, you do need lots of videos, it will work only with a long term plan. No push button riches!
You can use YouTube ads to get your views. A little known way to get cheap paid traffic is to hire someone from countries where you can get cheap clicks(e.g. Vietnam) and get them to set up ads for your videos. If you don't want to spend money, keep uploading and YouTube will start rewarding you at some point.