Reactivate or new investigation

I have a question about DHS/ICE investigations. I was initially granted a Secret clearance in 2018. This year (2021), I joined a private firm. Hated it, lol, and reapplied to DHS after 3 months. I have the job offer. My question is, will I have to go through the entire BI process again, or is my clearance still good for 2 more years, and can simply be reactivated.
Thank you!

That is up to DHS to decide.