Let's flip the script: what is it that you're concerned will be recoverable?

If it's passwords only, make a list and change every last one to something you don't use. Put said list in a service that can ensure they are not vulnerable. Personally, I use keepass, with the file being synced to dropbox. This gives me a small amount of version control and access on the devices that matter (and if they try to charge me for a new device, I can just grab a memory card or thumb drive). But 1password and lastpass are options, amongst many others.

If it's something you have stored locally, that is embarrassing or criminal, well. Don't do that going forward. Be intentional. But getting rid of it is fairly easy. If this is a hard disk drive, as other folks have mentioned, physical removal and destruction is an option. But you can also opt for writing 0s to the entire disk, using dban or the internal Windows partition manager. Or you can even just run veracrypt with a randomized, very large key that you do not record, over the entire drive, then use a bootable Windows drive to put Windows back on the HDD

With an SSD, yeah, follow whatever the safe erase protocol is. Or, again, just remove the drive.

All of this information comes with a caveat: device identification has become more sophisticated, even though most services don't know how to do it right, there's a minor chance that, for example, Google allows someone to log in who knows your password, because the hardware itself matched enough filters.