>>52546619
If you aren't going to do anything with them, export the seed phrase for each wallet (assuming they are different) to something long lasting (archival paper or something physical and long lasting). Then remove all traces of the wallets from your computer and store your seed phrase/private keys somewhere safe. This is if you are afraid of hacks. However, if your house goes up in flames then you lose it.
There's tradeoffs with every scheme, there's nothing perfect. Encrypting a text file containing your phrase is also fine but then you need to store the password somewhere, etc.