First of all, make sure your videos are actually worth watching. Having good quality videos is the first most important thing for your Youtube SEO (Search Engine Optimization) efforts.
Then, upon uploading, make sure to write a nice description and to include relevant tags, and to fill out any other information. Select a proper category, select the video language, etc.
After the video is uploaded - and I do this personally - share the video on your Twitter profile, Facebook page, Google+ page, Pinterest account, VK page, and anywhere else you can. On your website, on your blog, a relevant forum you’re a member of, etc.
Another thing that some people do especially after uploading a new video is they buy some views for it, and perhaps also some likes and comments.
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From this point on you can find other Youtube videos that are relevant to your video, and try to comment on them and get people to watch your videos. You know, a lot of people on Youtube like to binge-watch things and no matter how much content is produced they’re always looking for other Youtube channels and videos to start watching. And finding videos that are relevant to yours and then commenting on them can get people who are interested in the same niche/content to come to your channel.
And once they’re there, if your videos are good and interesting, they can stick around and become a regular viewer, subscribe to you, like and comment on your videos etc.
