Hi Chichun2002,
I am also as new as you in creating likeable YT videos. The viewership and subscribers count are not as expected.
Looking at your data, it is not too bad. Keep pushing and you'll breakthrough very soon.
Of late i came across this platform that can help to improve both viewership and subscribers count.
You may want to take a look.
I attached the file for you.
All the very best to you!