A single data wipe can erase all the files to the drive, for most cases, there are no reports that tells a recovered data is reconstructed from any data recovery.
Here is my suggestion for you:
* Transfer all your cryptocurrency into a new crypto wallet
* As the most of people did tell, just buy a new drive before selling it.
* Or if you don't want an extra expense, wipe it many times
If you want to be completely safe, then either install a new one (preferably an SSD), or try to sell a laptop without a hard drive.
This will do actually, but some people don't want to buy a 2nd hand laptop that is already opened or repaired. So you should ask the buyer if it's ok to do so it is fair from you both.
We have so called logical data recovery or data reconstruction but I doubt a normal people could do it. And of course don't tell your buyer about your crypto history.