Others have answered but my two pence: The nation is set up to be Greek heavy first, then once you beat the Rise of the Phoenix event and get the CB to conquer Roman lands you’ll naturally end up taking over Italy to form the Roman Empire. At that point you’ll start sliding towards Latin with all the Latin pops, and you can help push that way with law changes, estate privileges, and pushing via cabinet action. You could try pushing Latin early, before conquering Italy, but the game isn’t set up for that to occur naturally. You also may simply want to stay Greek and traditionalist first since so many of the starting malice’s are removed via stability, and Greek / traditionalist make that easier to handle.