For some applications you can store heat. For instance you can have an electric heater with a lot of bricks inside an insulator box in your house and move heat out of it convectively with a fan.
For static applications, wouldn't we be better off with batteries based on Sodium chemistry? Less efficient, but removing the geopolitics from one of the main components feels like a pretty big compensating factor.
Don't forget flow batteries using iron, vanadium and other chemistries, as well as various sorts of molten-salt batteries. For fixed installations we could put up with many inconvenient attributes if it gets the cost down.
Invest in Lithium mines.