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If you are tryin to make a Youtube channel and attract subscribers and become successful, then allow me to give you a few tips:
First, purge the words uh and umm from your vocabulary. We use them in casual speech for two reasons: first, to "hold turn," to tell others that I am not done yet; and, second, to buy time; to think about what to say next. YouTube is one-way. You have the microphone and it is your turn. And if you are making a formal presentation in which you want to present yourself well and be respectful of your viewers time, then you will have made an outline of what you want to say, maybe even written out a script, and rehearsed a few times such that you know what you want to say.
Second, minimize repeatition. Repeating and repeating is another symptom of being unprepared. Write out a simple outline and follow it.
A good high-level structure for any formal presentation is: tell 'em what you're gonna tell 'em, tell 'em, and the tell 'em what you told 'em. Spend 10-15% of your time introducing yourself and the topic, spend 70-80% of your time working through that outline making your points, and then spend the remaining 10-15% summarizing and concluding.
Speaking of concluding, my third suggestion) have a conclusion.
Photographically, more close-ups would be good, especially when reviewing a small object. Try to give the viewer the experience of holding the object. When we examine an object personally, we naturally look at it at different ranges.