The Sarmatians had a pretty good run IOTL, but the Gothic ascendancy in the Black Sea area started a chain of events that resulted in their eventual Slavicization.

Your challenge is to prevent this from happening and have them play a more dominant role as the Roman Empire declines. Bonus points if you can have them survive until at least 1000.
 
Maybe Goths could refuse to be vassal of Sarmstians so they could defeat and destroy the Scandinavian people under King Filter, leaving Sarmiants as the dominant culture. Then probably you have to prevent Avars invasion, to avoid starting the Slavicization process.
 
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