I checked your channel and one of your videos. Your channel and videos are good, you have your niche and a pretty big subscriber base as well.
You have a lot of subscribers but unfortunately not so much viewers on your latest videos and interaction as well (likes & comments)
Focus on the following:
- encourage your viewers to press that like button and comment
- analyse the retention time on your videos, is there a moment here most viewers just disappear. (more at this official google documentation:
https://support.google.com/youtube/answer/9314415?hl=en)
Ask yourself the following:
- is there something you can do to improve watch time, retention time?
As for SEO matters first video i watched:
View: https://www.youtube.com/watch?v=3lyU08xC8wc
You have a longtail keyword: Hot air balloon, which is mentioned 3x in your title. you can include more keywords by mentioning it once and find other relevant keywords using the TubeBuddy tool.
Sometimes I also check out the competition so type in the keywords where I want to be found, check out the length of the video, tags, description. Then I ask how to improve on this for the audience.
Good luck!