Biden's Student Debt relief excludes fed loans sold to Navient

My federal loans were sold to Navient and are not eligible for any of Biden’s student loan $50,000 relief? How about yours? What are we going to do about it?

My loans and those of my kids (yes, we are all up to our necks) is with Nelnet. I don’t understand why they handle these loans as if they are mortgages? Why such huge monthly payments?