One thing to consider is that CBS owns the studio in Mississauga, where Strange New Worlds is filmed. It was built and opened in 2019, so it's brand new.
Discovery, on the other hand, was filmed in rented studio space at Pinewood, in Toronto.
One can imagine, with Discovery ending, CBS will take this opportunity to put congregate all Trek production under one roof. A roof they own.
I bring all this up to simply ask this one question; does CBS have room to film yet another show?
With SNW, Starfleet Academy, and the Section 31 film all being made, they may simply not have room for another series and they may not want to continue to rent space at Pinewood.