Skill Empowerment

5th-level transmutation
Casting time: 1 action
Range: Touch
Target: A willing creature within touch range
Components: V S
Duration: Concentration, up to 1 hour
Classes: Artificer, Bard, Sorcerer, Wizard
Subclasses:

Your magic deepens a creature's understanding of its own talent. You touch one willing creature and give it expertise in one skill of your choice; until the spell ends, the creature doubles its proficiency bonus for ability checks it makes that use the chosen skill.

You must choose a skill in which the target is proficient and that isn't already benefiting from an effect, such as Expertise, that doubles its proficiency bonus.