I have just watched your Southern Upland video 1, and the main thing is that camera wobble. It's sort of always there, very slight, and is really easily fixed with a tripod, or even a simple adaptor on a walking pole if you use them.
And if I am being brutal, keep it short and snappy. You were there, we weren't. Over 7 minutes of that music had me switching off after about 3. A six hour walk should be a 3 minute video!
Here is a neat example of 16 hours reduced to 4 minutes!
https://www.alastairhumphreys.com/microadventure-3-sleep-hill/I have to make videos for part of my job, we had some training from an ex-BBC film journalist and it was such an eye opener. He was telling us that they used to have cameras on either side of a football pitch back in the day for better coverage, which seems totally logical. The effect though, is that when you switch cameras you switch the direction of play, so the red team are shooting right to left, switch cameras and they are now shooting left to right, switch back and they right to left again!
Little things I hadn't even thought about suddenly became blindingly bloody obvious. Like starting a shot out of focus then focusing is more effective than starting in focus from a distance and zooming in. Build the shot properly 2/3:1/3, so never have the subject of your shot in the middle, have it 1/3 in, up, down, across etc. If you can't see it properly, just don't have it there! Have a reference, so not just a mountain, have a mountain and something, to give the mountain a sense of scale and awe. Match the narration to the video, so if you say bird, have a picture of a bird, not a picture of a waterfall.
Hmmm, I hope you don't think I am being hyper-critical! Sorry if you do