If i may make a suggestion, with the IE peoples* moving southward (or at least a good chunk of them), the Uralic peoples* might take their place moving westward.
*to the extent that these large linguistic groups can be called a "people"
My understanding of the matter was that modern research points to the Corded Ware Culture being associated with Uralic languages, and so I was already probably going that route. However, it also seems that Bell Beakers were not originally an Indo-European-speaking group until they collided with Yamnaya migrants in Central Europe, where the so-called “Northwestern Indo-European”, i.e. Italo-Celtic, Germanic, Balto-Slavic, and perhaps Albanian and Illyrian (if we accept that Albanian is closer to Germanic than anything else), broke off from Late Indo-European. So, it’s possible that the Bell Beaker’s will continue their expansion across Europe culturally and linguistically, and that might mean Uralic languages being more of a Northern European thing.
Still, the expansion of the Corded Ware people seems to have been associated with conquest, and so they might just continue their rampage through Westerb Europe (they were already in Eastern France before the IE expansion). It could be very interesting to see Uralic languages spoken across most of Europe indeed, though. But, they would likely break up into their own distinct branches, which... creates more work. Lol
I already have to create several distinct branches of Indo-European for the Middle East and the Balkans, re-write the evolution of Anatolian languages as they will not have the same substrata, put together as much material I can on how Sumerian influenced Akkadian, get all of the info I can on Hurro-Urartian and Hattic, and also try to snuff out what is available on the “bannana languages” of the Middle East. Oh, and let’s not forget Proto-Semitic! I need as much as I can get on that too...
Obviously, it will be some time before we start seeing the first of this timeline.