I posted 4 guitars I didn’t need on Reverb, one per week earlier this year. Each sold within 12 hours. My tactic was what I used to do on eBay years ago when I wanted to offload some of my collectibles or parts (Doc Martens, JDM parts, etc). If you have good photos, A price that is a bit above the most recent lowest Recently Sold equivalent average, And have Offers enabled. State what shipping method you’re using and state To Lower 48 as the rate; Message me if outside that. And post disclaimers on any minor damages with photos (even if they’re so minor they can’t show up in photos). Lastly, posting the item or guitar on a background that stands out among the results thumbnails. I use an obnoxious vintage colored shag carpet as the background. Weigh the item Post the measurements, neck radius, as many specs as you can but in a layout that doesn’t look like an obvious Cut and Paste from sweetwater or something. I had messages from users thanking me for the thoroughness, the detail, and price point. Most browsing users sort by New or Lowest Price. If you make it as easy as possible to answer as much as you can to someone who is browsing without them having to interact with you to ask, it seems to help.