KiddieToysReview
I Love YTtalk
Good advice. Many channels do not use description too much, just copy and past title. You got to 6K subs in 6 moth. How did you pick your tags? I am changing tags ( looking to the VidIQ ) and have very little improvement so far. I have an education channel with cartoons.
Tags are picked primarily in 80/20 fashion:
80% are longer tailed search terms, usually directly from the YT search bar (as long as they are relevant)
20% common kids channels tags: toys, kids, family fun, etc...
I do extensive research on other successful channels and have a large spreadsheet with tags per video for the large toy channels. If you compile something like this you can see patterns and get a feel for how successful channels tags their videos.