I'm a novice at using iMovie (free on any Mac). It's aMAZingly simple to use and you can do some really cool stuff with it, both with the video and the accompanying soundtrack, transitions, title slides, credits, etc. I watched a couple of short iMovie tutorials on YouTube that helped me get started.
The hardest part by FAR is the part where you have to edit your video down to < 4 minutes. If I already have the mavic video clips, I can throw together a pretty cool little movie with sound in about 15-20 minutes. But then I have to spend a very frustrating 2-4 hours editing it down to a length anyone would want to watch! (and it's still usually a little too long). It is SO hard to delete footage that you like, even it's boring to the average Joe. I have to keep reminding myself to WATCH TV! --->
Whether it's TV commercials, a movie, or a sitcom, very RARELY do you see a single shot lasting more than about 2 or 3 seconds straight. It's incredible how quickly our brains absorb and process a screen full of information. And we get bored after just a few seconds. Start noticing how many times you'll see a TV commercial where they cut to the next shot after less than 1 second. Especially if you're just looking at a landscape or simple scenery.
I've noticed that the standard mantra of basic photography also holds true in drone videos: If you put ANY human in the shot, anywhere, it is immediately 10 times more interesting. Have you noticed when watching a drone video, the part that always catches your attention and sometimes makes you pause the scene and/or get a second/better look is the part where you get to see the person controlling the drone? (Even though you don't know them from Adam.) Even if it's just for a split second, I want to catch a glimpse of the guy flying the drone from 150 in the sky rather than see 1 more second of an amazing waterfall.
My videos are much more interesting and easier to edit when I get my kids and/or friends to run around somewhere in the scene. Even a car driving by, or cyclist in the distance gives us a reason to keep looking for a few seconds more. People would rather see total strangers in a scene in favor of just a simple beautiful landscape any day.
Background music selection is also key, but that's a topic for a whole 'nutha thread. (But name just ONE Top 100 Movie that doesn't have an incredible, memorable, recognizable soundtrack.)
Like Dennis Miller likes to say: "That's my opinion. I could be wrong."