Vacuum the floors real well esp. the driver's side floor mat.
Get rid of the word "FIRM"
in the ad. If you really won't take less, price it at $4400 and take the first offer for $4k. Otherwise you will keep getting offers for $3500-3750 or so. Dealing with CL buyers, they're all going to want at least a few hundred off the asking price.
Expect to weed out some bad buyers. Don't respond back to those that want to help you sell the car. Otherwise agree with what others have already mentioned. Consider listing on others sites like Facebook marketplace, cars.com, autotrader.com, etc. Here are some more tips esp at the end of the article:https://www.moneycrashers.com/sell-your-car-on-craigslist/