It's really not that hard. It doesn't take much to get more people to subscribe to your account, just use an easy way to get likes for your tik tok videos, namely by buying them from an account improvement service. Further Tik Tok does everything for you, namely, it will see that the popularity of your videos is growing and, accordingly, more often recommends your channel to other users. Everything is very simple.
posting a lot of content
using trending audio (you can use original audio, add a trending song and mute it)
I seen a youtube video that has tags don't help all that much- so long your description is good
Consistency is key. The algo rewards content and will push your content if it knows the account is providing entertainment, value, etc. It just takes time to figure out what drives virality. Once you do, rinse and repeat.