Aside from creating great content, one of the fastest ways to get massive YouTube subscribers is to partner with influencers who have a large following in your niche. They can help promote your videos on their channels and social media accounts, which will then be shared with their followers.
Publish videos at the right time
Make sure your videos are published when your audience is likely to be online. This is best determined through your YouTube Analytics, where you can monitor the Audience tab to see when your viewers are most active.
The more often you produce content, the more likely your audience will be to subscribe to your channel. Ideally, you should try to publish at least a video a week.
Optimize your videos
Use keywords in your title, description, transcription file and thumbnails to optimize your video for YouTube search. This will help viewers find your videos and encourage them to click on them.
Include an end screen
At the end of your videos, ask viewers to subscribe and remind them of what they can expect from your content. You can also encourage them to share the video and channel with their friends.
Remember that only 30 seconds or the entire video (whichever is shorter) counts as a view on YouTube. So, try not to cheat and fake your views. Strategies for massive YouTube subscribers