League of Legends is very fun.

I play League of Legends often. It has been about four months since I installed it. I'm still unranked. It was difficult at first but I'm getting better and better now. I've even uploaded a video on Youtube. And I even do broadcasts in Korea. (You could also say "I've even uploaded a video on YouTube and do broadcasts in Korea.")

Good job! The last part is the only correction needed. In written English, no sentence can begin with the word "and."

"And" is a conjunction that links two words or phrases together, so it cannot begin a sentence. However, it's perfectly acceptable in spoken English to begin a sentence with "and."

Hope this helps! :)

By the way, what is the YouTube channel? I would like to see it!