Swiatek, Osaka, Andreescu, Raducanu and Rybakina.
Swiatek is a no-brainer. Even if she doesn't win a HC or Grass slam, she'll be in the hunt for next 7-8 RGs at the very least, and win a few more of them.
I think Osaka will win at least another 2 or 3 HC slams. She's not winning one in Paris or London though.
Injuries permitting, I think Andreescu will win at least another slam, although I still have question marks about her motivation to commit full-time to the sport.
Raducanu seems to be still trying to figure out what sort of player she wants to be, despite her 2021 game being good enough to win a slam. I suspect once the building blocks start to fall into place for her, she'll be a force and be in the hunt for grass and hard court slams, but it might take some time.
Rybakina has the big serve and easy power to beat anyone on any given day, so I think she'll win some more.