Most of them do their best in YouTube channels by posting videos but at the end they are discouraged by seeing their likes & subscriptions.
1. Firstly in my opinion we need to concentrate on the content of your channel.
Write a good description of the channel, add more tags. The advantage of adding tags is when a person search for a particular tag, your video will be displayed.
2. Fix your page for a particular content like prank videos, mobile reviews, movie reviews, or new films.
3. It should not be like your page shows the name as prank videos & your content is horror videos.
4. By doing such things people might report your channel & number of subscriptions will become less gradually.
5. You need to maintain your viewers by posting content based videos at least one video per day.
6. Try to attract the viewers by posting interesting contents.
7. Add a water mark to every video.
8. Add a subscription video at the end of every video, this helps to increase your subscriptions.
9. Answer for every comment politely & put a love symbol before commenting.
10. Don't copy the content from any other channels, be the original and attract people.
11. Share your videos in a community, like you discuss about your videos on online bloggers & forums.
12. You can actually discuss useful contents on indianstudychannel & promote your channel.
(But this should be a useful content for all).
13. Register to Anygram app, it is like a chatting app & making friends with all over world & you can learn new languages. There you can actually make friends & promote your channel.
14. Share your links on Instagram & Twitter.
15. Share your links with a good description in Facebook & ask people to share on their wall.
16. Increase your frequency of uploading the content. Produce a good content videos.
17. Write a good header text, short & sweet.
18. Link your channel link with SML magic.
19. Customize your video thumbnail.
20. Don't use big titles, and don't use awkward words in the title.
21. Share the links in your description.
All the best.