There's no actual word for streaks,
Like 连 means connect, 連勝 means Winning streaks. Like the streak itself can't be alone in Chinese... I don't think there's such a word, correct me if I'm wrong
If you're referring to day streaks "連天" may be the answer to your question although it's an adverb/verb so alterations for noun-ification will be necessary if you want to use it as a noun.
Ok I am really thankful for this Duo. The lessons are finished but I will continue to learn and improve. Should any of you need a script I made for learning Chinese from this course, please email me at durmitorlife@gmail.com