You're welcome.

If you were to play a Spirit Dragonborn, here's one cultural trait from the Dragoncult Culture you ought to get for your character.
Ethereal Umbra: Common amongst the essence dragons, this umbra shimmers with draconic will. While this umbra is active you can move through nonmagical solid objects and occupied spaces as if they were difficult terrain. Opportunity attacks made against you while this umbra is active have disadvantage. You cannot move further than 5 feet into walls or other solid objects in this way. If you would end your turn in an occupied space, you are shunted into the nearest unoccupied space and take 1d6 force damage.
Draconic Umbra. Dragon cultists are often blessed with power from the object of their devotion so that they may spread their dragon’s word or further its plans. As a bonus action, you can cause draconic power to course around you in a draconic umbra. This draconic umbra lasts for 1 minute or until you use a bonus action to end it. Once you have used this trait, you cannot use it again until after you finish a long rest.
This feature would allow your character to 'ghost' through things.