Extend Twitch Prime Sun?

Can you extend a Twitch Prime Sub with the next free Twitch Prime Sub? So with some streamers, for example, you can sub-divide, for example, for 12 months and then that's also there.

You have to manually extend the Twitch Prime Sub every month. He then adds every other month to the existing one.

If I have unsubsed today, I can only reinsubben again in a month and until then my first sub expired or right?

Yes, you have to expire it and then subscribe to the channel again. You can specify whether the months should continue counting or not