Unfortunately it’s a how long is a piece of string…….
I’ve mentioned previously about the perfect storm, lack of 2nd hand cars mainly due to no new car sales, no trade ins, no auctions and for some people plenty of COVID money/payments.
IMO that’s starting to change, there’s at least 4 of us expecting delivery of new build G29’s, some as early as the next few weeks, so if that’s a general trend then the trade ins/2nd had market will be getting a lift with more cars becoming available. I’d imagine that will be happening across the board in some way. Supply should increase meeting demand better, so prices should stabilise or drop. There’s also the seasonal factor.
The other thing is how sought after the car you want to shift is (to the appropriate market) and also if you want/need to replace it with something else? If you keep yours due to increasing prices it’s replacement may be following the same path so you’ll get more for your but pay more.
In your position I’d be looking at 1st, would I be happy with the price I get today and 2nd, how much out of my pocket to change?
If you’re just selling only you know what you’d be happy to accept.
If I’d sold my 35iS now instead of 6/8 weeks ago I’d have very likely got slightly more money for it today, but I was happy with the price I got (and still am) and happy with the deal on my new one and to me that’s what matters