But for Bitcoin, I don't know how this can be done as it may require revealing the secrete codes of the wallets or storage device. Is there any other way this can be done?
If you want your heirs to have access to your bitcoin only after your death without you having to reveal your private keys (or seed phrase), you can follow the guide provided by LoyceV.
Using Locktime for inheritance planning, backups or giftsAnyone who bothered visiting the link shared here, will understand why BTC is the future of money. The vision is clear, but one must not fail to keep the private keys safe, because it's 'not your keys, not your coins.'
I know the rates, or market trends or halving may affect ones capital investment to HODL for the future, let's say 5-7 years or even longer. The surety of it being a substantial amount upon withdrawal or passing it over to the next generation is one that stands guaranteed.