Hey, Follow these basic strategies to increase subscribers
1) Focus on your content and create a quality content to the audience. Content is king. The more value you'll add into the content, the more subscribers you'll get.
2) create an attractive thumbnail because it forces the viewers to watch videos and viewer can be converted into subscriber if you are providing top-notch content.
3) Use the hashtags in your post. Add at least 10 hashtags in your post. Don't add spammy hashtags like #followeme or #likemypost.
4) Improve your Youtube SEO by Adding Appropriate descriptions, titles, and tags. It not only rank your videos but also useful in increasing viewers and subscribers. There are many tools that will help in youtube users like google keyword planner and tube buddy,
5) Chances of increasing subscribers increase by using the different platform of promotion. For example, promotion on social media platform is a perfect channel to increase viewers and subscribers. Join different groups and communities to promote your content. You can also use Paid Ads.
6) Offer a giveaway contest and ask the audience to perform the different actions like ask them to like the video or to subscribe to the channel.
7) The best strategy to save time is to buy Youtube viewers and subscribers. I usually buy subscribers from instantviews.co. so I'll also recommend you to buy from them. I have a great experience with them. They provide quality service with excellent customer service.Here is the link : https://www.instantviews.co/