GSTIN status Inactive

I opt for new GSTIN number for my second business under same PAN, in JANUARY 2019 as a casual taxpayer.

I extended the initial 90 days grace period for as a casual taxpayer to another 90 days. So my timeline as a casual taxpayer ended in JULY 2019. But I didnt took any action to convert the registration from casual taxpayer to Normal taxpayer till August 2019. As a result my GSTIN status is showing INACTIVE.

Till time I hadn't filed any GST return, as my place of business is still in construction phase.

So I need to know should I opt for a new GSTIN now or if any chances revoke the same?

Also as i haven't  filed in GST return for my INACTIVE GSTIN, would there be any issues if I opt for new GSTIN?

Many Thanks.