Sure, here is a sample description for a motivational YouTube channel:
Welcome to my motivational YouTube channel! I'm here to help you reach your full potential by providing you with inspiring videos, quotes, and stories.
I believe that everyone has the power to achieve great things, and I want to help you tap into that power. My videos will cover a wide range of topics, including:

How to set and achieve goals

How to overcome challenges

How to build self-confidence

How to stay motivated

How to live a happy and fulfilling life
you'll subscribe to my channel.
Here are some of the benefits of watching motivational videos:

They can help you to stay positive and motivated

They can give you the inspiration you need to overcome challenges

They can help you to develop a growth mindset

They can help you to achieve your goals

If you're looking for a little extra motivation, I encourage you to check out my channel!

I hope this helps!