If you are planning to hold the coin, you should buy a Trezor or Ledger hard wallet. These are the purses that make your property the best security and no hackers can invade.
talking about long-term hold, for 5 years, ETH is definitely one of the best to hold long. When technology is truly thriving, big investors entering the crypto market will pay more attention to ETH. They have a great technology but it is not time for it to explode.
So, 5 more years will be a great time to come back and sell them.
By storing the coins in Trezor or Ledger, he can still withdraw and send them at any time. The OP intends to keep all coins and will not access them for the next 5 years, even though the OP is in need of money or death. After 5 years the OP opened its wallet again.
I think your idea of saving on Trezor or Ledger is a good idea, but you need to add something like a safe and forget about it. This is an effort so that FOMO or FUD are not carried away, which can frustrate the plan to hold coins in 5 years.