The phoenix sorcerer revised

You got your magic from fire; whether its from the elemental plane of fire or something else. Phoenix sorcerers have reputation for being reckless (gryffindor style).

Pyromancy:

when you reach a certain level, you gain certain spells, as shown. when you gain a spell from this feature, you always know it, it doesn't count against the number of spells you know, you can't switch it out when you level up, and if it isn't on the sorcerer spell list, it is nonetheless a sorcerer spell for you.

• Level 1. burning hands
• Level 3. scorching ray
• Level 5. fireball
• Level 7. wall of fire
• Level 9. flame strike

* "Level" means sorcerer level.

Confident

Starting at first level, you have advantage on saving throws against being frightened, and you can add you charisma modifier to your initiative.

Flames of destruction

Starting at 6th level, you gain resistance to fire damage, and whenever you deal fire damage with a spell, you can spend 2 sorcery points to ignore resistance to fire damage (except your own) for this casting. Additionally, whenever make an attack roll with a spell (which doesn't have to be a fire spell but it can)  you can spend 1 sorcery point to give yourself advantage on that attack roll.

Critical fire

Starting at 14th level, whenever you score a critical hit with a spell attack roll, you can roll one additional damage die. Additionally, you gain immunity to the frightened condition. Finally, you score a critical hit with a spell that deals fire damage on a 19 or a 20.

Phoenix soul

Starting at 18th level, you gain the following benefits:

• You gain immunity to fire damage
• When you are reduced to 0 hit points, you can spend 5 sorcery points to stand up with 1 hit point and deal fire damage to all creatures within 30 feet of you equal to 10d10+your charisma modifier.