Well we have One Piece, Haikyuu, My Hero Academia, Black Clover, Kimetsu no Yaiba, Act-Age,
Jujutsu Kaisen, and Chainsaw Man in stable spots, not likely to end within the next 2 years.
I'm banking on Tokyo Shinobi Squad and Samurai 8 sticking around.
I don't think Kimetsu no Yaiba is ending. I think it'll continue with a timeskip.
Hinomaru is ending next week.
The Promised Neverland could easily end this year or early next.
Yuuna I'd expect to end this year.
We Never Learn will last at least another year with the second season. I wouldn't expect it to stick around too much longer afterwards.
Dr. Stone will probably get a second season due to sheer push, but its lack of growth will halt further promotion of this beached from birth whale and it'll eventually end.
Saiyuuki, Yui Kamui, Beast Children, and Double Taisei are going to be cancelled.
That's 9 slots open within the next 2 years.
Sure, there's always 2-3 fodder slots but the shape of the magazine is about to change so much and some major new pillars are about to come in.