what about a similar language, like the slavic and baltic language are quite different. maybe the slavic language could stay more baltic ? I mainly want to have a language similar to baltic, instead of slavic, not saying slavic isnt a beautiful language, but baltic languages deserve something too

I mean, i know the language would not be 100% same, but still would it be possible that either the people who are going to be the Balts, migrate southwards, were they found various kingdoms and such? like slavs did ?