As others have mentioned, making the first few seconds eye catching/thought provoking/etc. is a major hook for viewers. It’s the first thing they hear and see of you, so make it interesting and memorable. That’s why so many YouTubers have unique intros and things they say that are specific to them. You can approach this in multiple ways - a comedic beginning, asking a question, interesting b roll and footage montage, the list goes on. If you don’t get the viewers in the first few seconds, you won’t have them for the rest of the video. I’ve clicked out of a video after a few seconds for multiple different reasons. Sometimes it’s as simple as ensuring the background audio is not going to murder people’s ear drums.
For my videos I write scripts, so sometimes I’ll remind myself while recording that I need to talk faster. This really helps ensure the pace is still moving and there’s no awkward breaks. People (generally) take in info faster hearing it than reading it.
Although... I know your channel is more of vlogs, so I’d say really ask yourself if certain clips need to be in the video. Scrub through the sections to find places where cut video doesn’t flow well and try to add in or get rid of stuff to clear it up a bit.
Good luck!