sorry to hear but this is not uncommon. not sure if you ever been to sister site to clearance blogs which is clearance jobs. Lyndy from here has tons of podcast posted with a now retired lawyer in the clearance world.
His name is Sean Bigley. He recommends Berry and Berry LLC I believe.
I would invest in hiring one if you can afford it. If not then you’ll need to wait two yrs at least to try and apply again.
Just be upfront with the lawyer if you decide to hire one. Again I would go over to clearancejobs site and search for Sean Bigley. He is still actively writing for the site. He did an episode once on work retaliation. Hope all turns out well for you.