I would say that you should buy a ledger wallet, store your passwords and secret phrases on paper, and just leave it somewhere you do not have access to for a year or more. So you would not even think about selling your coins.
"Just leaving it somewhere" is OK, if you could remember all the passwords and pin numbers. Normally what happens is that when you don't use a password for a long time, you tend to forget it. And writing down the passwords or sharing them with someone (either family members or close friends) is not a very safe option. The main issue in storing your coins in hardware wallets is not with someone hacking the wallet and stealing your coins. The major issue is the user forgetting the password and then losing the access to the coins.