It's going to have to have something new/different from other yellowstone shows. We already know Spencer lives until 1968ish from the epilogue. Yellowstone flashbacks show John II (the baby born in 1923) as an old man and didn't father John III (Costner) until the 50s. They could try and create life or death tension but we know who lives so any death drama will have to involve non-mainline Duttons. The mainline family tree is known now so there's no drama around which pregnancy produces the heir.
These shows are basically printing money right now though, so I'm sure it will do well. There's plenty of unknowns to create stories for as well; Jack and Elizabeth's child, Spencer's second son with some widow. There's also other Dutton headstones in present day that haven't been explained although there's no logical explanation for them yet (they could be older siblings to Costner, but why would a younger son be the "third"). They could also repeat a Jacob/Cara situation and just make up new Duttons who show up as needed to fill in generational gaps.