"Now what? Do it again!"
Translation:Entä nyt? Tee se uudelleen!
Not much. Uudelleen and uudestaan are derived from uusi, "new", so in some contexts they might be better translated as "anew", but usually just "again". Taas can sometimes mean "on the other hand" in e.g. "kun taas..."
http://randomfinnishlesson.blogspot.com/2018/03/uudestaan-uudelleen-taas.html and https://hinative.com/en-US/questions/409483 discuss this same question. Google may find even more on that, those were just the first two.