70-339 is getting retired in Jan-2021 so you should be still able to appear this exam. Certification will be active for 2 years from passing the exam. Unfortunately there is no new replacement exam for this according to this question.
You can browse available exams here and opt for any suitable you find.
https://video2.skills-academy.com/en-us/learn/certifications/
else post a new question here which is a dedicated forum on MS certifications -
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&cancelurl=%2Fen-us
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Please don't forget to Accept Answer and Up-vote if the response helped -- Vaibhav