Extra security?

Good evening everyone, i have purchased a cold wallet to hold my coins and i went with Dcent. When owning these cold wallets and running their firmwares on your computers, do you have any extra type of security running on your computer just to be safe while doing transactions? My fear is getting hacked and i know i have to write down my seedphrase and lock it away in a safe place. I'd rather add another layer of security, if there's any.