Buffing the Storm Sorcerer from SCAG to be on par with other Sorcerer Subclasses

The Storm Sorcery subclass from SCAG is widely regarded as the weakest of the sorcerer subclasses, see here. We – as in my Dnd group – mainly play without multiclassing, so combinations like this don’t help the problem.

To buff the class I thought of the following:

  1. Include the casting of Cantrips for triggering Tempestous Magic
  2. Include the casting of Cantrips with lighting/thunder effects for triggering Heart of the Storm

This would synergies especially with the Thunderclap Cantrip:

You create a burst of thunderous sound that can be heard up to 100 feet away. Each creature within range, other than you, must make a Constitution saving throw or take 1d6 thunder damage.

The spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).

Is the Storm Sorcery Subclass with this buff still balanced, especially compared to the other Sorcerer Subclasses?