- Where do I sell it these days?
Facebook Marketplace seems to be the default place to sell cars these days. Just expect to have to filter out a lot of scams, sob stories, fakes, etc.
- How do sites like Carmax work and are they worth it?
Online they usually make an offer based on the car and a questionnaire on the condition. I sold a car during the insane COVID inflation of car prices to Carvana and the process went fine. I just entered my current car's info into Carmax's online calculator and they offered $1000.
With a rebuilt title any type of trade-in is at a dealership is going to lowball you, so selling to another individual is probably best for your finances.