Protecting the Wallet
The wallet on a darknet market is meant for transactions, not custody, and treating it as a vault is the mistake that costs the most. Here is how to use it the way it was designed, and the habits that keep a balance from becoming the loss you were trying to avoid.
The buffer, not the vault
Deposit for the order, spend the order, withdraw the rest. The balance on the platform at any moment should be close to what you are about to spend. A wallet that is a buffer has little to lose. A wallet that is a vault is carrying an exposure the design was never meant to cover, no matter how well the rest of the platform is run.
Where the rest goes
The coins you are not about to spend go to an address you control. A hardware wallet, a non custodial mobile client, a paper address. The point is that they are off the platform, where a market going down does not touch them. The transfer is the protection, and doing it regularly is the habit.
The habits that hold
Withdraw on a schedule, not on a mood. Keep the on platform balance below a line you set and do not cross it. And never let a balance grow because it is convenient. Convenience is the reason the vault fills up, and the vault is the thing that is not the wallet for.