Bitcoin being a very secure crypto currency, I do not think there is a better infestation other than crypto currency investment. Maybe gold could be a choice of physical investment that interests outside of crypto. But infestations outside of crypto are not so comfortable as crypto. Physical investment must be an intermediary that will make it more difficult to run it. Also today crypto currency has a very high value. If you have to choose, of course I will choose crypto for long-term investment. You can see 30 years ahead I think crypto will have a very high selling value