Without SEO, your videos will not be discovered, and you will not get any views, thus, there will be no earnings. However, youtube does not provide specific data on keywords, so SEO on youtube videos can be really tricky. However, you can use a lot of third party apps to optimize your videos. These third-party tools will provide you keyword ideas so that you can focus on specific words and phrases. you can also identify low competition and high value search terms. SEO tools for youtube will help you research and understand the relevant trends.