Here is a 2010 1SS with low miles in excellent condition near you for sale......I'd keep an eye on it and see what it sells for. You should be able to get around $1000-$1500 more since yours is a 2SS and has less mileage.
Cars depreciate....even when cared for and rarely driven. It won't start increasing in value until it's 25 years old. Don't feel bad, some cars lose 60% of their value in 4 years.
https://www.cargurus.com/Cars/invent...ting=255883990
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Roto-Fab intake, SW 1 7/8" LT w/hi flow cats, Flowmaster outlaw exhaust, UDP, 160* stat, Circle D 3200, Moroso catch can, TCI line lock, Zex Nitrous 125 shot, 3.91 gear, Eaton True-trac, DSS 1000hp axles.