Reactivating DOT

First go to FMCSA and download Form MCSA 5889

https://www.fmcsa.dot.gov/sites/fmcsa.dot.gov/files/2021-01/MCSA-5889%20Form%201-5-21%20exp%20508.pdf

Then submit the form online at https://ask.fmcsa.dot.gov/app/answers/detail/a_id/108/kw/reactivate