I put this sucker on the market in the fall (bad time, I know). I got a great job offer I couldn't refuse and had to move.

Unfortunately, I have yet to "realize" my new, higher salary because I'm paying double for housing until the old place sells. It's a nice house, not too old, large, pool, etc., in a good neighborhood but it's not getting many showings.

Is it in the suburbs? All my home-buying-age friends are moving into/near the city, the definition of "good neighborhood" has shifted a bit from years past.

Have you lowered the price? A house properly priced will move in any market.

I listed it for exactly what it was listed for when I had bought it... about 7 months prior (and at that time it drew multiple offers within 2 weeks on market).

It really was an unexpected situation.

Markets can change rapidly.

Off season is december. Now is more or less the good times.

Is it not late spring right now?

Late spring is late May-early June

OP said 6 months. that's a long off-season.

Yes, November 2018 - April 2019 is the prior 6 months. Not a lot of house selling going on usually. The majority of house sales are not within those months (at least in the US). A lot of it is regional (weather related) as well, but it's really mostly dictated by the school year. Most parents try to avoid moving their kids to a new school mid-year if they can help it and wait until school gets out to move.

https://www.zillow.com/sellers-guide/best-time-to-sell/

I feel like you're trying to say that house sales just stop, or come close to it, during this time. When the reality is it's more like a few % points drop in volume. If it took OP an extra week or three sell? Sure. But 6 months? Something else is wrong.