Bring a Trailer tends to bring the highest Bids, as they are much more selective about what they list, but the process takes about 2mo (since they are heavily back-logged).
They don't like, if you had the car listed elsewhere, prior or concurrently.
However, if you list it, on these classifieds, I doubt
BaT would know (if you don't tell them).
Then you can use the next 2mo, to see if it sells, before
BaT gets around to going Live, with your listing.
CarMax might make you happy also, as you can use their "7-Day Quote" and see if others are willing pay more.
Their payment process is very quick and trustworthy (they might even deal with the Title Issues for you).
CraigsList is possibly the next best, but it will hurt you, if you don't sell it there, as BaT bidders will probably have seen it and mention such, in the listing comments (which effectively reveals your reserve).
Another option is trade it for a CT4 BW (+cash) as the CT4 has a much lighter clutch ; )
Any Cadillac dealer around should jump that offer.
Make the CT4 replacement at MSRP a condition of the Trade.