1. Be professional. Try to make your videos look good with a good intro and ending with links to other videos. Also, record videos with better quality and better audio. (use a microphone). Go look at some popular minecrafters' videos for suggestions.
2. Be unique. Don't try to copy other minecrafters. Do something that is unique to stand out from the crowd.
3. Upload high-quality videos constantly and regularly. Remember, nothing is achieved easily. Try to spend some time into making these videos look good.
4. Try a series of related videos to draw viewers in or do tutorials as well. Remember, always act professionally but not too uptight. Joke around but don't be offensive.
5. Have fun! If you're having fun, you're viewers will too!
6. Be persistent. If at first your efforts do not garner viewers, don't give up! Keep trying to improve.
I wish the best of luck in your endeavors.