Bitcoin is "money" and not a "currency." Bitcoin works very wonderfully as money.
Bitcoin is not very wasteful in energy, contrary to the pushed narrative by those that want everyone to believe this is truth. Bitcoin uses a tiny fraction, currently around 7-9% of the electricity that the global banking system currently uses. Bitcoin uses a very large portion of renewable energy sources, and will continue to balance it's energy use towards efficiency and optimizations.
Your part 2/3 etc, it's not a currency. Bitcoin is pure money. We also do not really ever use gold for currency. It is money. Bitcoin is a better money than gold. Once you stop drumming on the wrong path, you'll more easily understand the differences and stop banging your head about how it's a bad currency. It's not a great currency, while it is the very best form of money.
Your whole bit about meandering into defending it's value as currency or store of value, is just highlighting your total misunderstanding of the value of gold, or the new digital version of gold as money. Money IS a store of value.
Lastly, Bitcoin really has no fundamental problems. Nobody that knows about bitcoin gives a flying fuck about the price.