Metamagic

Dragonic Fury
Prerequisite: Draconic Bloodline sorcerous origin
When you cast the primal savagery cantrip, you can spend 3 sorcery points to imbue yourself with the fury of your dragon lineage for 1 minute. For the duration, whenever you cast your primal savagery cantrip, you can make an additional attack with it as a bonus action.

Elemental Ancestry
Prerequisite: Draconic Bloodline sorcerous origin
Whenever you deal damage of the type associated with your dragon ancestor, and this damage would be affected by resistance, you can spend 1 sorcery point to draw upon the energy of your ancestors and overwhelm any natural or magical resistances. All damage you deal until the end of your next turn ignores resistance against the damage type associated with your dragon ancestor.

Frightful Spell
Prerequisite: Draconic Bloodline sorcerous origin
When you cast a spell that forces one or more creatures to make a saving throw and at least one fails its saving throw, you can spend 2 sorcery points and choose one of the affected creatures that failed its saving throw. The target becomes frightened of you until the end of your next turn.