There are a number of things that help YouTube algorithm in recommending your videos.
1. Never upload your videos through mobile phones. When you edit a video in your mobile and save it. That raw file name will be a combination of alphabets and numbers. Even if you rename the file, when you will upload it through your mobile it will be saved on YouTube system with the first name like 123andhj98. Now YouTube system (Algorithm) will not recommend such videos to anyone. So there will be very less chance for your video to be explored by the audience. On the other hand, after editing your video in mobile, if you shift your video to computer or laptop and rename it, then upload it on YouTube. It will be saved on the YouTube system with the name you have renamed like "How to upload a video on YouTube". Now YouTube system (Algorithm) will not only rank your video but also recommend it to the right audience because from the file name system knows what kind of audience will need this video. This will increase traffic on your channel.
2. Strong and appropriate tags will help YouTube algorithm to recommend your videos. Also YouTube System will rank your videos and add them in others suggested videos. It will also increase traffic on your channel.
You can visit my channel and see the video on how to upload videos the right way, some common mistakes you tubers make, YouTube watch time threshold confusions and much more. Hope this will help you.
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Yeah that's true. But you have to work really hard to get paid from YouTube.