Rate my homebrew subclass

I’ve created a homebrew subclass based on noelle from genshin impact. idk if this is where i should ask but can i get a honest review/feedback with some balancing tips? Thanks 🙂

Oath of the earthern protector:

Oath Spells: You gain oath spells at the paladin levels listed.

paladin level: spells: 3rd shield, protection from evil and good 5th aid, prayer of healing 9th beacon of hope, Life Transference 13th Guardian of Faith, aura of life 17th mass cure wounds, Skill Empowerment

Channel divinity: When you take this oath at 3rd level, you gain the following two Channel Divinity options. See the Sacred Oath class feature for how Channel Divinity works. -Devotion: When an ally (excluding you) within 60 ft. takes damage that would reduce its health below 1. You can use your channel divinity as a reaction to give that ally temporary health to absorb the hit for them. this temporary health equals four times your constitution modifier + your paladin level and will stay until the end of the targets next turn.

-Inspiring Smite: Immediately after you deal damage to a creature with your Divine Smite feature, you can use your channel divinity as a bonus action to distribute temporary hit points to creatures of your choice within 30 feet of you, which can include you. The total number of temporary hit points equals 2d8 + your level in this class, divided among the chosen creatures however you like.

3rd level: Earthern Breastplate: You can use your bonus action to guard yourself with a layer of transparant protective earth that surrounds you like a bubble for 1 minute. Upon activating this skill, you deal damage to enemies within 5 ft. equal to your constitution modifier. You then gain temporary health equal to twice your level in this class + your constitution modifier.

While you have this temporary health, your attacks inspire your allies to keep fighting. Once per turn when you hit an enemy, you and up to 3 allies you choose within 30 ft. will be healed for 1d6+ your constitution modifier.

you can use this feature a number of times equal to your Proficiency bonus. you regain your expended uses when you finish a short or long rest.

5th level: Whirlwind Attack: You can use your action to make melee attacks against any number of creatures within your reach, with a separate attack roll for each target.

7th level: Aura of warding: While an ally is within 10 feet of you, it has resistance to all damage. Also, each time it takes damage, you take the same amount of damage. At 18th level, the range of this aura increases to 30 feet.

15th level: When your breastplate expires due to its duration or is broken by damage from a hostile creature, the shield will shatter, scattering sharp pieces of earth in all directions, all creatures within 10 feet must make a dexterity saving throw equal to 8 + your strength modifier + proficiency bonus. taking four times your strength modifier on a failed save, or half as much on a succesful save.

20th level: Sweeping time: as a bonus action, you can call upon the power of the earth to guide your strikes in battle for 1 minute. gaining the following benefits: -your weapon gains a reach of 15 ft. -your weapon attacks will deal extra damage equals your constitution modifier. -the healing from earthern breastplate can now occur twice per turn.

once you use this feature, you cannot do so again until you finish a long rest.