It's still better to do them all at once, or at least not drag them out for too long, otherwise you'll get confused.
Do you have any insider information about the release dates?
But after your words, I started thinking about the release of new characters. I heard somewhere that Baal will be in the next patch along with Sara (probably some information from leakers, I don't look for it specifically, but it keeps popping up). But it's not a fact that she will be the first banner right after Yoimiya.
Mihoyo will definitely disappoint me if they put Hu Tao in the next banner. I don't even want her first constellation as much as I want her weapon - I have 4 characters fighting for 3 decent spears, and the old man has to run around with a black brush. But I still hope that Hu Tao will be somewhere around Halloween. It would be logical, although who knows what the Chinese have in mind.
To sell my soul