Yes, you wait. You may be waiting quite a while for a dealer to give you one of their allocations. But you get exactly what you want. If you go around to dealerships and make it clear you're serious, you'll even pay no more than you would otherwise. Negotiate price no differently. This market is a bit of a nuisance, but even now the vet salespeople will still play ball, because someone that serious is actually an easy sale. They'll still sell what's on the lot or floor plan, but now they just sold ANOTHER car. Know several people recently who've done just this.
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Not limited to luxury vehicles either. Had someone at somewhere I was doing consulting for ask me about how he'd go about it for a Subaru Legacy, in the base trim, with ALMOST NO OPTIONS. He wanted exactly what he wanted, and nothing more. Told him just to go do it.
He did. He waited about 4.5 months (because it had to be built per the build schedule, then shipped on a boat!), but he got exactly what he wanted, for the price he asked for. To him it was completely worth not having it, "right now". He told me that after seeing how relatively little work was involved, he'd never buy a car off the lot again.
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Average sale price of a new car in the US is $48K. People regularly pay $60-130K (or far more!) for luxury cars. Sorry, I can't compromise on something with a 5-digit (or 6-digit) price tag.