SO CLOSE (help me!)

Hi! The noob here. Over on my youtube channel I've posted a video in which I just can not deliver checkmate (I'm talking about the second game, which starts at minute 8). Can you help me please? If so, this link will take you to the video, thank you in advance: 

https://www.youtube.com/watch?v=HHWPVCEuLGE

If you're new to all of this, the A Noob's Life channel is the space where I share my daily efforts in order to become a better chess player by posting live games, puzzles, game analyses and much more. Have a look at what you see and if you like it please consider subscribing and commenting about what my mistakes were, I am a noob and I need your help to get better at the game!