Where can I advertise my Twitch / YouTube channel? Free and efficient
On social media or in the comments section of YouTube videos with similar content.
Instagram nowhere else does good content
You can advertise your videos on YouTube. But it costs money.
There's no cost
to advertise you have to pay money, if you want it to be advertised by many, it is really expensive
Not like that at all. The only option you have left, if you want it to be free, is to post it on social media platforms. For example in a Facebook group that is only there to promote each other. Or in normal groups. In the first case it won't do you any good because everyone is only interested in themselves. And in the second case, at best, you will only get hate for shameless self-promotion.
So in the end you only have the option to spend money.