How can I improve my videos/channel?

[SidTV]

Hey guys, new travel vlog here.. A few videos up. I have 20plus videos to edit and put up, but before I do, how can I make them better?

I know I need a trailer, so I'm working on that now, but it's actually the hardest for me haha

Any advice would be great!
https://m.youtube.com/channel/UCtaektIu60yxg0XOpJNPGWg