‘scholar’:
In short. what your interpretation means is that the 70 years of Zechariah was a period of 'fastings' only and is a separate period to that of Jeremiah's 70 years both separate periods have different beginnings and endings and run parallel to each other in the course of Jewish history.
Your waffling circumlocutory aside, it is indeed a separate period. It’s not really ‘my interpretation’, it is clearly indicated in Zechariah 7:1-7. It specifically indicates 70 years of fasting that had continued until Darius’ 4th year (518 BCE). So it obviously isn’t referring to Babylon’s 70 years that ended decades earlier in 539 BCE. And of course it’s not referring to a nonexistent ‘70-year exile’ found nowhere in the Bible. It’s only nutty religious types like yourself who are desperate for it to mean something other than what it directly states. 😂