advertising is not about raising demand. it's about deterring FUD.
There are different purposes for advertising campaigns. Tesla should begin doing some soon, not to increase demand this or next quarter but to start building positive mind share among the non EV enthusiast vehicle demographic and make them aware of all the ways Tesla EVs are superior to ones by old ICE companies coming late to the party. This would be a multi year advertising strategy that then leverages any EV advertising done by the competitors. Let them spend large sums making the point that EVs are desirable, while Tesla spends modest sums showing all the ways Tesla's EVs are better to own.