Hi. If you need help you may have to be more precise in your questions.
If this is your YouTube channel then you seem to have got the basics of video editing so it seems it's the 4K aspect of it you are finding problematic.
If so, what is the main problem? If that is your channel then you appear to be using a Go-Pro and/or a drone of some kind so any 4K footage is going to be more demanding on your computer than the HD videos you have done in the past. So I'm guessing you are having problems importing and processing the video footage.
Again, if that's the case then we will need a lot more information about the precise problems you have.
You should really read this topic for what we need from people to be able to help them.