For how long do you need to keep it going?
At one point, it makes sense to open up a small loss-making restaurant, a taxi business, or any other biz which is a plausible cash accepter.
If, however, you're a part-time drug seller who works alone, it's better to purchase something for cash first. Used cars make you 3-5% loss without specific know-how. In Amsterdam and Berlin, smaller drug boys also use cash-to-crypto ATMs and directly spend in a store which accepts crypto; plenty of spending options in both cities.
PS. Beware the lurking nigerian princes and princesses. I'm sure they all have excellent solutions︀ to accept your cash.smi(&%